Research Article |
|
Corresponding author: Yong Wang ( yongwangbis@aliyun.com ) Academic editor: Samantha C. Karunarathna
© 2024 Deecksha Gomdola, Rajesh Jeewon, Eleni Gentekaki, Ruvishika S. Jayawardena, Kevin D. Hyde, Fatimah Alotibi, Yong Wang.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Gomdola D, Jeewon R, Gentekaki E, S. Jayawardena R, Hyde KD, Alotibi F, Wang Y (2024) Assigning Xiuguozhangia (genus incertae sedis) to Pseudoberkleasmiaceae (Dothideomycetes, Pleosporomycetidae, Pleosporales) and introducing X. broussonetiae as a novel species. MycoKeys 111: 181-210. https://doi.org/10.3897/mycokeys.111.136202
|
Xiuguozhangia species are dematiaceous hyphomycetes that are characterised by acropleurogenous, dictyoseptate, campanulate or cheiroid, and brown to dark brown conidia that are composed of several layers of cells radiating from a protuberant basal cell, and mostly seen with appendages arising from the apical cells. The genus was introduced based on morphology to accommodate five of the six Piricaudiopsis species that exhibited holoblastic conidial ontogeny. Xiuguozhangia was referred to as Ascomycota genus incertae sedis as it was challenging to resolve its taxonomic placement based solely on the available morphological data (no DNA sequence data was previously available). In this study, we provide DNA sequence data for LSU, ITS, SSU, TEF1, and RPB2 for our isolates, collected from Broussonetia papyrifera (Moraceae) in northern Thailand. Based on morphology, we classify our isolates as Xiuguozhangia. Since they form a sister lineage to Pseudoberkleasmium, we place Xiuguozhangia in Pseudoberkleasmiaceae (Pleosporales). Within Xiuguozhangia, we establish these two isolates as a new taxon, Xiuguozhangia broussonetiae, in view of the presence of new conidiogenous cells developing from subtending cells. Xiuguozhangia broussonetiae differs from the extant species in the genus as it has longer conidiophores that are sometimes branched, comprising numerous septa, and its appendages are mostly untapered (sometimes tapering) towards the tips, a feature not observed in other Xiuguozhangia species. This is the first study to provide DNA sequence data and phylogenetic relationships for Xiuguozhangia. Furthermore, we analysed selected DNA sequence data and provided an updated phylogenetic tree incorporating all families (with representative genera) of Pleosporales.
1 new taxon, hyphomycetes, morphology, phylogeny, sequence data, taxonomy
Xiuguozhangia was introduced by
Initially, five Xiuguozhangia species were established, all of which are combinations of Piricaudiopsis viz., Xiuguozhangia appendiculata, X. indica, X. punicae, X. rhaphidophorae and X. rosae. Piricaudiopsis was established by
The highlights of this study are as follows: (i) We provide DNA sequence data for multiple gene regions (LSU, ITS, SSU, TEF1, and RPB2) for our isolates, collected from Broussonetia papyrifera (Moraceae) in northern Thailand; (ii) Based on morphology, we classify our isolates as Xiuguozhangia. Since they form a sister lineage to Pseudoberkleasmium, we place Xiuguozhangia in Pseudoberkleasmiaceae (Pleosporales); (iii) Within Xiuguozhangia, these two isolates could potentially represent a new taxon, Xiuguozhangia broussonetiae in view of the presence of new conidiogenous cells developing from subtending cells. This is the first study to provide DNA sequence data and phylogenetic relationships for Xiuguozhangia. In addition, we analysed selected sequence data from GenBank and provided an updated phylogenetic tree incorporating all families (with representative genera) of Pleosporales.
Decaying stems of Broussonetia papyrifera (Moraceae) colonised by hyphomycetes were collected from deciduous forest in the Mae Fah Luang University Botanical Garden, Chiang Rai, Thailand during the dry, hot season; collection information was noted (
The holotype specimen and ex-type living culture have been deposited in the
Mae Fah Luang University Herbarium (
The new species is established based on the morphological species concept and complemented with the phylogenetic species concept (
Total genomic DNA was extracted from axenic cultures grown on PDA for 28 days using the BIOMIGA Fungus Genomic DNA Extraction Kit (BIOMIGA, San Diego, CA, USA), following the manufacturer’s instructions. The internal transcribed spacer (ITS), large subunit (LSU), and small subunit (SSU), and the genes for RNA polymerase 2 (RPB2) and translation elongation factor 1α (TEF1) were amplified using the following primers: ITS1/ITS4, LR0R/LR5, NS1/NS4 for ITS, LSU, and SSU, respectively (
The polymerase chain reaction (PCR) mixture had a final volume of 20 µL, comprising 10 µL of PCR master mix, 1 µL of the forward and reverse primers each (10 µM stock concentration), 7 µL of double-distilled water, and 1 µL of the template DNA. The PCR conditions were as follows: initial denaturation at 95 °C for 3 min; denaturation at 95 °C for 45 s; annealing at 55 °C for 50 s (ITS), 52 °C for 50 s (LSU and SSU), 58 °C for 1 min 30 s (RPB2 and TEF1); extension at 72 °C for 2 min; and final extension at 72 °C for 10 min (number of cycles = 40). Purification and bidirectional sequencing of PCR amplicons were carried out at Sangon Biotech (Shanghai) Co., Ltd., China.
The raw reads were checked using DNA Baser Assembler, and ambiguous bases from the 5’ and 3’ ends were trimmed manually. Consensus sequences were generated using SeqMan (DNAStar, Madison, Wisconsin, USA). The sequences have been deposited in the NCBI GenBank database, and accession numbers for all strains are provided (Table
Names, isolate numbers, and the corresponding GenBank accession numbers of taxa used in the phylogenetic analyses. Type, ex-type, and reference strains are denoted with T. The new isolates are in bold font.
| Species | Isolate/strain number | LSU | ITS | SSU | TEF1 | RPB2 |
|---|---|---|---|---|---|---|
| Acrocalymma aquatica |
|
JX276952 | JX276951 | JX276953 | – | – |
| Acrocalymma pterocarpi |
|
MK347949 | MK347732 | MK347840 | MK360040 | – |
| Ageratinicola kunmingensis | KUMCC 21-0217 T | NG_243113 | NR_191196 | NG_242816 | – | – |
| Aigialus grandis | BCC 20000 T | GU479775 | – | GU479739 | GU479839 | – |
| Alternaria atrobrunnea | FMR 16868 T | – | LR537033 | – | LR537051 | LR537044 |
| Alternaria alternata | AFTOL-ID 1610 T | DQ678082 | KF465761 | KC584507 | KC584634 | KC584375 |
| Amniculicola aquatica |
|
MK106096 | – | MK106108 | MK109800 | – |
| Amorocoelophoma cassiae |
|
MK347956 | MK347739 | NG_065775 | MK360041 | MK434894 |
| Anastomitrabeculia didymospora |
|
MW412978 | NR_172008 | NG_073568 | MW411338 | – |
| Anastomitrabeculia didymospora |
|
ON077069 | ON077080 | ON077074 | ON075063 | ON075067 |
| Angustimassarina lonicerae |
|
KY496724 | KY496759 | – | – | – |
| Anteaglonium gordoniae |
|
MK347977 | MK347761 | MK347867 | MK360042 | MK434881 |
| Anteaglonium gordoniae | CD7 | – | OK335788 | – | – | – |
| Anteaglonium latirostrum | GKM1119 T | GQ221874 | – | – | GQ221937 | – |
| Anteaglonium latirostrum | GKML100Nb | GQ221876 | – | – | GQ221938 | – |
| Aquadictyospora clematidis |
|
MT214545 | MT310592 | MT226664 | MT394727 | MT394679 |
| Aquastroma magniostiolata | HHUF 30122 T | AB807510 | LC014540 | AB797220 | AB808486 | – |
| Aquasubmersa japonica | HHUF 30469 T | NG_057138 | NR_154739 | NG_062426 | LC194384 | LC194421 |
| Aquasubmersa japonica |
|
OP377971 | OP377885 | OP378047 | OP473059 | OP473118 |
| Aquasubmersa japonica |
|
OP377958 | OP377872 | OP378036 | OP473051 | OP473112 |
| Aquasubmersa mircensis |
|
NG_042699 | JX276954 | NG_061141 | – | – |
| Aquihelicascus songkhlaensis |
|
MN913692 | MT627680 | – | MT954380 | – |
| Aquihelicascus songkhlaensis |
|
MN913724 | MT627696 | MT864319 | MT954369 | MT878464 |
| Aquimassariosphaeria kunmingensis | KUMCC 18-1019 T | MT627661 | – | MT864312 | MT954409 | MT878454 |
| Ascocylindrica marina | MD6011 T | KT252905 | – | KT252907 | – | – |
| Ascocylindrica marina | MF416 | MK007123 | – | MK007124 | – | – |
| Astragalicola vasilyevae |
|
MG828986 | NR_157504 | MG829098 | MG829193 | MG829248 |
| Astrosphaeriella fusispora |
|
KT955462 | – | KT955443 | KT955425 | KT955413 |
| Atrocalyx glutinosus | DAOM: 252609 T | OQ400928 | OQ400918 | – | OQ413076 | OQ413081 |
| Atrocalyx glutinosus | CHEM 2721 | OQ400930 | OQ400920 | – | – | OQ413084 |
| Bahusandhika indica | GUFCC 18001 | KF460274 | KF460273 | – | – | – |
| Bambusicola bambusae |
|
JX442035 | JX442031 | JX442039 | – | KP761718 |
| Berkleasmium aquaticum (Tubeufiales) |
|
KY790432 | KY790444 | – | KY792608 | MF535268 |
| Berkleasmium aquaticum (Tubeufiales) |
|
KY790431 | KY790443 | – | KY792607 | MF535267 |
| Berkleasmium longisporum (Tubeufiales) |
|
MH558825 | MH558698 | – | MH550889 | MH551012 |
| Berkleasmium longisporum (Tubeufiales) |
|
MH558826 | MH558699 | – | MH550890 | MH551013 |
| Bertiella fici |
|
MW063223 | – | MW079351 | MW183786 | – |
| Bertiella fici | NCYU 19-0073 | MW063224 | – | MW079352 | MW183787 | – |
| Bipolaris adikaramae | HSF070 T | – | MN535176 | – | MT548605 | – |
| Boeremia linicola | CBS 116.76 T | GU237938 | GU237754 | – | KY484705 | KT389574 |
| Boeremia linicola | CBS 248.38 | KT389703 | KT389486 | – | – | KT389575 |
| Biatriospora borsei | NFCCI-4245 T | MK358813 | MK358818 | MK358811 | MK330938 | – |
| Biatriospora marina | CY 1228 | GQ925848 | – | GQ925835 | GU479848 | GU479823 |
| Brevicollum hyalosporum | MAFF 243400 T | LC271239 | LC271242 | LC271236 | LC271245 | LC271249 |
| Brevicollum hyalosporum |
|
MG602200 | MG602204 | MG602202 | MG739516 | – |
| Brevicollum versicolor | HHUF 30591 T | NG_058716 | NR_156335 | NG_065124 | LC271246 | LC271250 |
| Brunneoclavispora camporesii |
|
MN809328 | MN809329 | – | – | – |
| Brunneofusispora clematidis |
|
MT214570 | MT310615 | MT226685 | MT394629 | MT394692 |
| Camarosporium quaternatum | CPC 31081 T | NG_064442 | NR_159756 | KY929123 | KY929201 | – |
| Camarosporomyces flavigenus | CBS 314.80 T | GU238076 | MH861266 | NG_061093 | – | – |
| Camarosporidiella caraganicola | MFLUCCC 14-0605 T | KP711381 | KP711380 | KP711382 | – | – |
| Camarosporidiella melnikii |
|
MF434250 | MF434162 | MF434338 | MF434425 | – |
| Capulatispora sagittiformis | HHUF 29754 T | NG_042319 | NR_119393 | NG_060997 | LC001756 | – |
| Caryospora aquatica |
|
NG_059058 | NR_156408 | MH057850 | – | – |
| Caryospora submersa |
|
MN913720 | – | – | – | – |
| Clematidis italica |
|
KU842381 | KU842380 | KU842382 | – | – |
| Coelodictyosporium rosarum |
|
MG828991 | MG828875 | MG829102 | MG829195 | – |
| Corylicola italica |
|
MT554926 | MT554925 | MT554923 | – | MT590776 |
| Corynespora cassiicola | CBS 100822 | GU301808 | – | GU296144 | GU349052 | GU371742 |
| Corynespora torulosa | CPC 15989 T | KF777207 | NR_145181 | – | – | – |
| Crassimassarina macrospora | MAFF 239606 T | LC194344 | LC194478 | LC194302 | LC194389 | LC194426 |
| Crassimassarina macrospora | HHUF 30512 | LC194343 | LC194477 | LC194301 | LC194388 | LC194425 |
| Crassiperidium octosporum | MAFF 242971 T | LC373108 | LC373096 | LC373084 | LC373120 | LC373132 |
| Crassiperidium octosporum | MAFF 246401 | LC373111 | LC373099 | LC373087 | LC373123 | LC373135 |
| Cryptocoryneum japonicum | HHUF 30482 T | NG_059035 | NR_153938 | NG_065118 | LC096144 | LC194438 |
| Cryptocoryneum pseudorilstonei | CBS 113641 T | NG_059036 | NR_153941 | LC194322 | LC096152 | LC194446 |
| Cucurbitaria berberidis |
|
KC506796 | – | KC506800 | – | – |
| Curvularia austriaca | CBS 102694 T | – | MN688802 | – | MN688856 | – |
| Curvularia eleusinicola | USJCC-0005 T | – | MT262877 | – | MT432925 | – |
| Cylindroaseptospora leucaenicola |
|
MK347966 | NR_163333 | MK347856 | – | – |
| Cyclothyriella rubronotata | CBS 141486 T | KX650544 | NR_147651 | NG_061252 | KX650519 | KX650574 |
| Dacampia hookeri | GZU 73897 | KT383792 | – | – | – | – |
| Dacampia hookeri | GZU 81840 | KT383795 | – | – | – | – |
| Dacampia hookeri | GZU 75980 | KT383794 | – | – | – | – |
| Delitschia nypae |
|
– | – | – | MK360049 | MK434878 |
| Dendryphion fluminicola |
|
MG208141 | NR_157490 | – | MG207992 | – |
| Deniquelata cassiae | CMD012A T | OR500088 | OR500092 | OR500090 | OR501827 | – |
| Dictyocheirospora bannica | KH 332 T | AB807513 | LC014543 | AB797223 | AB808489 | – |
| Didymella exigua | CBS 183.55 T | MH868977 | MH857436 | GU296147 | – | – |
| Didymella rumicicola | CBS 683.79 T | MH873007 | KT389503 | – | – | KT389622 |
| Dothidotthia robiniae |
|
MK751817 | MK751727 | MK751762 | MK908017 | MK920237 |
| Epicoccum duchesneae | CGMCC 3.18345 T | KY742249 | KY742095 | – | – | MT018115 |
| Epicoccum duchesneae | CBS 218.81 | MN973322 | MN972935 | – | – | MN983572 |
| Falciformispora aquatica |
|
MK063643 | MK064216 | – | MK099811 | – |
| Falciformispora tompkinsii | CBS 200.79 T | MH872968 | MH861199 | KF015639 | KF015685 | KF015719 |
| Fenestella crataegi | CBS 144857 T | – | NR_165534 | – | MK357555 | MK357512 |
| Fissuroma calami |
|
MF588993 | – | NG_062430 | MF588975 | – |
| Flammeascoma lignicola |
|
KT324583 | KT324582 | KT324584 | KT324585 | KT324586 |
| Flavomyces fulophazii | CBS 135761 T | NG_058131 | NR_137960 | NG_061191 | – | – |
| Foliophoma fallens | CBS 161.78 | GU238074 | KY940772 | GU238215 | – | KC584502 |
| Fuscostagonospora cytisi |
|
KY770978 | – | KY770977 | KY770979 | – |
| Fuscostagonospora sasae | HHUF 29106 T | AB807548 | AB809636 | AB797258 | AB808524 | – |
| Fusculina eucalypti | CBS 120083 T | DQ923531 | DQ923531 | – | – | – |
| Fusculina eucalyptorum | CBS 145083 T | MK047499 | NR_161140 | – | – | – |
| Fusiformispora clematidis |
|
MT214542 | MT310589 | MT226661 | MT394725 | MT394677 |
| Gordonomyces mucovaginatus | CMW 22212 T | JN712552 | JN712486 | – | – | – |
| Halojulella avicenniae | BCC 20173 T | GU371822 | – | GU371830 | GU371815 | GU371786 |
| Helminthosporiella stilbacea |
|
MT928157 | MT928159 | MT928161 | MT928151 | – |
| Hermatomyces amphisporus | CBS 146610 T | LR812664 | LR812664 | – | – | – |
| Hermatomyces amphisporus | CBS 146613 | LR812662 | LR812662 | – | LR812657 | LR812668 |
| Hermatomyces amphisporus | CBS 146614 | LR812666 | LR812666 | – | LR812660 | LR812671 |
| Hermatomyces anomianthi |
|
OK655817 | OL413437 | – | OM117546 | – |
| Hermatomyces bifurcatus | CCF 5900 T | LS398263 | LS398263 | – | LS398417 | LS398344 |
| Hermatomyces bifurcatus | CCF 5899 | LS398262 | LS398262 | – | LS398416 | LS398343 |
| Hermatomyces clematidis |
|
MT214556 | MT310603 | MT226673 | MT394735 | MT394684 |
| Hermatomyces constrictus | CCF 5904 T | LS398264 | LS398264 | – | LS398418 | LS398345 |
| Hermatomyces hainanensis | GZCC 23-0592 T | OR091329 | OR098708 | – | – | – |
| Hermatomyces indicus (=H. thailandicus) |
|
KU764692 | KU144920 | KU712468 | – | KU712488 |
| Hermatomyces indicus (=H. thailandicus) |
|
KU764693 | KU144921 | KU712469 | – | KU712489 |
| Hermatomyces indicus (=H. thailandicus) |
|
KU764694 | KU144922 | KU712470 | KU872756 | KU712490 |
| Hermatomyces iriomotensis | KH 361 | LC194367 | LC194483 | – | LC194394 | LC194449 |
| Hermatomyces jinghaensis | HKAS 112167 T | MW989519 | MW989495 | – | MZ042642 | – |
| Hermatomyces krabiensis (=H. chiangmaiensis) |
|
KX525742 | KX525750 | – | – | KX525754 |
| Hermatomyces krabiensis (=H. chiangmaiensis) |
|
KY559394 | – | – | – | – |
| Hermatomyces maharashtraensis | NFCCI 4879 T | NG_241939 | NR_189384 | – | MZ130659 | MZ130660 |
| Hermatomyces megasporus | CCF 5898 T | LS398266 | LS398266 | – | LS398420 | – |
| Hermatomyces megasporus | CCF 5897 | – | LS398265 | – | LS398419 | LS398346 |
| Hermatomyces nabanheensis | KUMCC 16-0149 T | KY766059 | KY766058 | KY766060 | KY766061 | – |
| Hermatomyces pyriformis | CGMCC 3.27462 T | PP491962 | PP491964 | – | PP505452 | PP505454 |
| Hermatomyces pyriformis | UESTCC 23.0441 | PP491963 | PP491965 | – | PP505453 | PP505455 |
| Hermatomyces reticulatus (=H. subiculosus) |
|
KX259523 | KX259521 | KX259525 | KX259527 | KX259529 |
| Hermatomyces reticulatus (=H. subiculosus) | CCF 5893 | LS398267 | LS398267 | – | LS398421 | LS398347 |
| Hermatomyces sphaericoides | CCF 5908 T | LS398273 | LS398273 | – | LS398427 | LS398352 |
| Hermatomyces sphaericoides | CCF 5895 | LS398270 | LS398270 | – | LS398424 | LS398350 |
| Hermatomyces sphaericus | PMA 116080 | LS398281 | LS398281 | – | LS398431 | LS398356 |
| Hermatomyces sphaericus | PMA 116081 | LS398283 | LS398283 | – | LS398432 | LS398357 |
| Hermatomyces sphaericus | PRC 4105 | – | LS398286 | – | – | – |
| Hermatomyces sphaericus | PRC 4104 | – | LS398278 | – | LS398430 | LS398355 |
| Hermatomyces sphaericus | KZP 462 | – | LS398287 | – | LS398434 | LS398359 |
| Hermatomyces sphaericus | PRM 946201 | – | LS398284 | – | LS398433 | LS398358 |
| Hermatomyces sphaericus | PRC 4116 | – | LS398275 | – | – | – |
| Hermatomyces sphaericus | PRC 4100 | LS398277 | LS398277 | – | LS398429 | LS398354 |
| Hermatomyces sphaericus | PRC 4106 | LS398279 | LS398279 | – | – | – |
| Hermatomyces sphaericus | PMA 116085 | – | LS398280 | – | – | – |
| Hermatomyces sphaericus | PMA 116082 | – | LS398285 | – | – | – |
| Hermatomyces sphaericus | PRC 4117 | – | LS398276 | – | – | – |
| Hermatomyces sphaericus |
|
OL782061 | OL782144 | OL780526 | – | – |
| Hermatomyces sphaericus | HKAS 112725 | MW989516 | MW989492 | – | MZ042639 | MZ042636 |
| Hermatomyces sphaericus | HKAS 112166 | MW989517 | MW989493 | – | MZ042640 | MZ042637 |
| Hermatomyces sphaericus (=H. biconisporus) | KUMCC 17-0183 | MH260296 | MH275063 | MH260338 | MH412771 | MH412755 |
| Hermatomyces sphaericus (=H. chromolaenae) |
|
KY559393 | – | – | – | – |
| Hermatomyces sphaericus (=H. pandanicola) |
|
KX525743 | KX525751 | KX525747 | KX525759 | KX525755 |
| Hermatomyces sphaericus (=H. saikhuensis) |
|
KX525740 | KX525748 | – | KX525756 | KX525752 |
| Hermatomyces sphaericus (=H. saikhuensis) |
|
KX525741 | KX525749 | – | KX525757 | KX525753 |
| Hermatomyces sphaericus (=H. tectonae) |
|
KU764695 | – | NG_063603 | KU872757 | KU712486 |
| Hermatomyces sphaericus (=H. tectonae) |
|
KU764696 | KU144918 | KU712466 | KU872758 | – |
| Hermatomyces sphaericus (=H. tectonae) |
|
KU764697 | KU144919 | KU712467 | – | KU712487 |
| Hermatomyces trangensis | BCC 80741 T | KY790600 | KY790598 | KY790602 | KY790606 | KY790604 |
| Hermatomyces trangensis | BCC 80742 | KY790601 | KY790599 | KY790603 | KY790607 | KY790605 |
| Hermatomyces tucumanensis | CCF 5912 | LS398288 | LS398288 | – | LS398435 | LS398360 |
| Hermatomyces tucumanensis | CCF 5915 | LS398290 | LS398290 | – | LS398437 | LS398362 |
| Hermatomyces tucumanensis | CCF 5913 | LS398289 | LS398289 | – | LS398436 | LS398361 |
| Hermatomyces turbinatus |
|
MW989518 | MW989494 | – | MZ042641 | MZ042638 |
| Hermatomyces verrucosus | CCF 5903 T | LS398292 | LS398292 | – | LS398439 | LS398364 |
| Hermatomyces verrucosus | CCF 5892 | LS398291 | LS398291 | – | LS398438 | LS398363 |
| Hongkongmyces aquaticus |
|
MN913694 | – | MT864302 | MT954379 | – |
| Hypsostroma caimitalense | GKM1165 T | GU385180 | – | – | – | – |
| Hypsostroma thailandicum |
|
MZ435867 | MZ435865 | – | – | – |
| Jeremyomyces labinae | CBS 144617 T | MK442529 | MK442589 | – | MK442695 | MK442665 |
| Juncaceicola alpina | CBS 456.84 T | MH873460 | MH861761 | KY090699 | KF253139 | KF252188 |
| Keissleriella camporesiana |
|
MN401741 | MN401745 | MN401743 | MN397907 | – |
| Latorua caligans | CBS 576.65 T | NG_058180 | – | – | – | – |
| Latorua grootfonteinensis | CBS 369.72 T | NG_058181 | – | – | – | – |
| Lentimurispora urniformis |
|
MH179144 | – | MH179160 | MH188055 | – |
| Lentithecium clioninum | HHUF 28199 T | NG_059391 | NR_154137 | NG_064845 | AB808515 | – |
| Lentithecium pseudoclioninum | HHUF 29055 T | NG_059392 | AB809633 | NG_064847 | AB808521 | – |
| Leptosphaeria chatkalica | YGS22 T | MW886099 | MW886101 | MW886100 | MW915583 | – |
| Leptosphaerioides guizhouensis | GZAAS 19-4017 T | OP099529 | OR225067 | OR134435 | – | – |
| Leptosphaerioides guizhouensis | GZAAS 19-4018 | OP099530 | OR225068 | OR134436 | – | – |
| Leucaenicola phraeana |
|
MK348003 | MK347785 | NG_065784 | MK360060 | MK434867 |
| Leucaenicola aseptata |
|
NG_066309 | NR_163332 | NG_065776 | MK360059 | MK434891 |
| Libertasomyces myopori | CPC 27354 T | NG_058241 | KX228281 | – | – | – |
| Ligninsphaeria jonesii |
|
KU221037 | – | – | – | – |
| Ligninsphaeria jonesii | GZCC 15-0080 | KU221038 | – | – | – | – |
| Lindgomyces cigarospora | G619 T | KX655804 | KX655794 | KX655805 | – | – |
| Lindgomyces ingoldianus | ATCC 200398 T | AB521736 | NR_119938 | NG_016531 | – | – |
| Longicorpus striataspora |
|
MK035988 | MK035965 | MK035973 | MK034428 | MK034436 |
| Longiostiolum tectonae |
|
KU764700 | KU712447 | KU712459 | – | – |
| Longipedicellata aptrootii |
|
KU238894 | KU238893 | KU238895 | KU238892 | KU238891 |
| Longipedicellata megafusiformis | SJ-KR4 T | MZ538546 | MZ538512 | – | MZ567090 | – |
| Lonicericola qujingensis | GMBCC1178 T | OM855602 | OM855593 | OM855616 | OM857556 | – |
| Lophiostoma carpini | CBS 147279 T | MW750386 | NR_173000 | – | MW752405 | MW752384 |
| Lophiostoma clavatum |
|
MN274566 | – | MN304835 | MN328901 | – |
| Lophiotrema eburnoides | MAFF 242970 T | LC001707 | LC001709 | LC001706 | LC194403 | LC194458 |
| Magnibotryascoma kunmingense | HKAS 111919 T | MW424785 | MW424770 | MW424800 | MW430106 | MW430113 |
| Magnibotryascoma rubriostiolatum | CBS 140734 T | – | KU601590 | – | KU601609 | KU601599 |
| Magnicamarosporium iriomotense | HHUF 30125 T | AB807509 | AB809640 | AB797219 | AB808485 | – |
| Massaria inquinans | CBS 125591 T | MH875187 | MH863726 | HQ599442 | HQ599340 | – |
| Massarina pandanicola |
|
MG646947 | MG646958 | MG646979 | MG646986 | – |
| Massarioramusculicola chiangraiensis |
|
MH040228 | MH040227 | MH040229 | – | – |
| Massariosphaeria clematidis |
|
MT214544 | MT310591 | MT226663 | – | – |
| Matsushimamyces bohaniensis | CBS 140592 T | KR350633 | KP765516 | – | – | – |
| Misturatosphaeria aurantonotata | GKM 1238 T | NG_059927 | – | – | GU327761 | – |
| Montagnula acaciae |
|
ON117298 | ON117280 | ON117267 | ON158093 | – |
| Montagnula aquatica |
|
OP605986 | OP605992 | OP600504 | – | – |
| Montagnula aquatica | KUNCC 23-14425 | OR583116 | OR583097 | OR583135 | OR588088 | OR588107 |
| Morosphaeria muthupetensis | NFCC I4219 T | MF614796 | MF614795 | MF614797 | MF614798 | – |
| Multilocularia bambusae |
|
KU693438 | KU693446 | KU693442 | – | – |
| Multiseptospora thailandica |
|
KP744490 | KP744447 | KP753955 | KU705657 | – |
| Murilentithecium lonicerae |
|
MK214373 | MK214370 | MK214376 | MK214379 | – |
| Murispora galii |
|
KT709175 | KT736081 | KT709182 | KT709189 | – |
| Muritestudina chiangraiensis |
|
MG602248 | MG602247 | MG602249 | MG602251 | MG602250 |
| Neoastrosphaeriella phoenicis |
|
MN712339 | MN735995 | MN699324 | MN744232 | MN744233 |
| Neobambusicola magnoliae | HKAS 107122 T | ON870389 | ON878076 | ON870914 | – | – |
| Neocamarosporium goegapense | CPC 23676 T | KJ869220 | KJ869163 | – | – | – |
| Neocamarosporium halophilum | RSM70 T | – | OR242722 | – | OR289930 | – |
| Neocamarosporium halophilum | BBB RMS57 | OR297952 | OR297950 | – | OR339881 | – |
| Neohelicascus aquaticus | KUMCC 19-0107 T | MT627662 | MT627719 | MT864314 | MT954384 | – |
| Neolophiostoma pigmentatum |
|
KT324588 | KT324587 | KT324589 | KT324590 | – |
| Neomassaria fabacearum |
|
KX524145 | – | NG_061245 | KX524149 | – |
| Neomassaria formosana | NTUCC 17-007 T | MH714756 | – | MH714759 | MH714762 | MH714765 |
| Neomassaria hongheensis | KUMCC 21-0344 T | OL423113 | OL477614 | OL423115 | OL754594 | OL754595 |
| Neomassarina chromolaenae |
|
MT214466 | MT214372 | MT214419 | MT235785 | MT235822 |
| Neomassarina pandanicola |
|
MG298946 | MG298945 | MG298947 | – | – |
| Neomassarina thailandica |
|
NG_059718 | NR_154244 | – | – | – |
| Neomassarina thailandica |
|
MT214467 | MT214373 | MT214420 | – | – |
| Neooccultibambusa thailandensis |
|
MH260308 | MH275074 | MH260348 | MH412780 | MH412758 |
| Neophaeosphaeria phragmiticola | KUMCC 16-0216 T | MG837009 | – | NG_065735 | MG838020 | – |
| Neophaeosphaeria livistonae | NCYUCC 19-0393 T | OQ437387 | OQ437390 | OQ437393 | – | – |
| Neoplatysporoides aloes | CPC 36068 T | MN567619 | NR_166316 | – | – | – |
| Neopyrenochaeta annellidica |
|
MT183502 | MT185538 | – | – | – |
| Neopyrenochaeta cercidis |
|
MK347932 | MK347718 | MK347823 | – | MK434908 |
| Neopyrenochaeta chiangraiensis |
|
MT183503 | MT185539 | MT214975 | MT454041 | – |
| Neopyrenochaetopsis hominis | UTHSC: DI16-238 T | LN907381 | LT592923 | – | – | LT593061 |
| Neoroussoella chiangmaiensis |
|
OQ065735 | OQ065738 | OQ065736 | OQ186448 | OQ186450 |
| Neothyrostroma encephalarti | CPC 35999 T | MN567613 | MN562105 | – | MN556831 | – |
| Neotorula aquatica |
|
KU500576 | KU500569 | KU500583 | – | – |
| Neotorula submersa | KUMCC 15-0280 T | KX789217 | KX789214 | – | – | – |
| Nigrograna italica |
|
OR538591 | OR538590 | – | OR531366 | OR531365 |
| Occultibambusa bambusae |
|
KU863112 | KU940123 | – | KU940193 | KU940170 |
| Occultibambusa jonesii | GZCC 16-0117 T | KY628322 | – | KY628324 | KY814756 | KY814758 |
| Ochraceocephala foeniculi | CBS 145654 T | MN516774 | MN516753 | MN516743 | MN520149 | MN520145 |
| Ohleria modesta | CBS 141480 | – | KX650563 | KX650513 | KX650534 | KX650583 |
| Ohleria modesta | WU 36870 | – | KX650562 | – | KX650533 | KX650582 |
| Omania hydei | SQUCC 13750 T | MW077155 | MW077146 | MW077162 | MW075772 | MW276077 |
| Paraconiothyrium kelleni | CBS 149290 T | NG_229027 | NR_185757 | OP348926 | OP328919 | – |
| Paradictyoarthrinium aquatica |
|
NG_064501 | NR_158861 | – | – | – |
| Paradictyoarthrinium diffractum |
|
KP744498 | KP744455 | KP753960 | – | KX437764 |
| Paradictyocheirospora tectonae | AMH 10301 T | MW854647 | MW854646 | – | MW854832 | – |
| Paralophiostoma hysterioides | PUFNI 17617 | MT912850 | MN582758 | MN582762 | – | MT926117 |
| Paraleptosphaeria polylepidis | MA 57843 T | – | NR_119469 | – | – | – |
| Paraleptosphaeria polylepidis | APA-2999 | MK795717 | MK795714 | MK795720 | MK831009 | – |
| Paramonodictys globosa | HKAS 129169 T | OR091331 | OR139016 | – | OR494045 | OR494048 |
| Parapyrenochaeta protearum | CBS 131315 | JQ044453 | JQ044434 | – | – | LT717683 |
| Periconia delonicis |
|
NG_068611 | – | NG_065770 | – | MK434901 |
| Periconia pseudodigitata | KT 1395 T | AB807564 | LC014591 | AB797274 | – | – |
| Phaeomycocentrospora xinjangensis | CGMCC 3.20479 T | OK256190 | OK256193 | – | – | – |
| Phaeoseptum mali |
|
MK625197 | MK659580 | – | MK647990 | MK647991 |
| Phaeoseptum terricola |
|
MH105779 | MH105778 | MH105780 | MH105781 | MH105782 |
| Phaeosphaeria oryzae | CBS 110110 T | KF251689 | KF251186 | GQ387530 | – | KF252193 |
| Pleomonodictys capensis | CBS 968.97 T | KY853521 | MH862684 | – | – | – |
| Pleomonodictys capensis | DLUCC 1323 | MZ420757 | MZ420742 | – | – | MZ442696 |
| Pleomonodictys descalsii | FMR 12716 T | KY853522 | KY853461 | – | – | – |
| Plenodomus changchunensis | CCMJ 5011 T | OL897174 | OL996123 | OL984031 | – | – |
| Plenodomus changchunensis | CCMJ 5012 | OL966928 | OL996124 | OL984032 | – | OL944508 |
| Pleopunctum clematidis |
|
MT214573 | MT310618 | – | MT394632 | MT394693 |
| Pleopunctum thailandicum |
|
MZ198896 | MZ198894 | – | MZ172461 | – |
| Polyschema sclerotigenum | UTHSC DI14-305 T | KP769976 | KP769975 | – | – | – |
| Prosthemium alni |
|
KY815013 | KY797636 | – | KY815019 | – |
| Prosthemium intermedium | HHUF 30063 T | AB553778 | AB554108 | – | – | – |
| Pseudoasteromassaria aquatica |
|
MN913721 | MT627674 | MT864322 | MT954378 | – |
| Pseudoastrosphaeriella longicolla |
|
KT955476 | – | – | KT955438 | KT955420 |
| Pseudoastrosphaeriella thailandensis |
|
KT955478 | – | KT955457 | KT955440 | KT955416 |
| Pseudoberkleasmium acaciae |
|
NG_066316 | NR_163343 | NG_065782 | MK360073 | – |
| Pseudoberkleasmium chiangmaiense |
|
MK131260 | MK131259 | – | MK131261 | – |
| Pseudoberkleasmium chiangmaiense |
|
OM065940 | OM066271 | OM065948 | OM102996 | OM102997 |
| Pseudoberkleasmium chiangmaiense |
|
MT214585 | MT310630 | MT226698 | MT394643 | MT394699 |
| Pseudoberkleasmium chiangmaiense | DLUCC 1655 | MZ420759 | MZ420744 | MZ420749 | MZ442693 | – |
| Pseudoberkleasmium chiangraiense |
|
OL584200 | OL584189 | OL606408 | OL912943 | OL697401 |
| Pseudoberkleasmium chiangraiense |
|
OL584201 | OL584190 | OL606409 | OL912944 | OL697402 |
| Pseudoberkleasmium chiangraiense |
|
OL584205 | OL584191 | OL606410 | OL912945 | OL697403 |
| Pseudoberkleasmium pandanicola | KUMCC 17-0178 T | MH260304 | MH275071 | MH260344 | – | – |
| Pseudochaetosphaeronema chiangraiense |
|
MZ457922 | MZ457923 | – | MZ476770 | – |
| Pseudochaetosphaeronema chiangraiense | UESTCC 23.0065 | OR253260 | OR253108 | – | OR251160 | – |
| Pseudochaetosphaeronema irregulare | CGMCC 3.22458 T | OQ758163 | OQ798972 | OQ758194 | OQ809057 | OQ809023 |
| Pseudochaetosphaeronema irregulare | CGMCC 3.22461 | OQ758162 | OQ798971 | OQ758193 | OQ809056 | OQ809022 |
| Pseudocoleodictyospora sukhothaiensis |
|
KU764710 | KU712440 | NG_062416 | – | KU712493 |
| Pseudocoleodictyospora thailandica |
|
KU764701 | NR_154337 | NG_062417 | – | KU712494 |
| Pseudocoleophoma heteropanacicola | ZHKUCC 23-0880 T | OR365486 | OR365456 | – | OR700204 | – |
| Pseudolophiotrema elymicola | HHUF 28984 T | LC194381 | LC194505 | LC194339 | LC194418 | LC194473 |
| Pseudomassarina clematidis |
|
MT214586 | MT415397 | MT226699 | MT394644 | MT394700 |
| Pseudopyrenochaeta lycopersici | FMR 15746 T | EU754205 | NR_103581 | NG_062728 | – | LT717680 |
| Pseudopyrenochaeta terretris | FMR 15327 T | LT623216 | LT623228 | – | – | LT623287 |
| Pseudotetraploa rajmachiensis | NFCCI 4618 T | MN937204 | MN937222 | – | – | – |
| Pseudoxylomyces elegans | KT 2887 | AB807598 | LC014593 | AB797308 | AB808576 | – |
| Profundisphaeria fusiformispora | GZAAS 20-4010 T | – | – | OR134442 | OR140432 | OR146942 |
| Profundisphaeria fusiformispora | GZAAS 20-4012 | OR209667 | – | OR134443 | OR140433 | – |
| Pyrenochaetopsis leptospora | CBS 101635 T | GQ387627 | JF740262 | NG_063097 | MF795881 | LT623282 |
| Pyrenochaetopsis tabarestanensis | IBRC:M 30051 T | KF803343 | NR_155636 | NG_065034 | – | – |
| Quadricrura bicornis | HHUF 30023 T | AB524613 | AB524797 | AB524472 | AB524828 | – |
| Quercicola fusiformis |
|
MK348009 | MK347790 | MK347898 | MK360085 | MK434864 |
| Quercicola guttulospora |
|
MK348010 | MK347791 | MK347899 | MK360086 | – |
| Quixadomyces cearensis | HUEFS 238438 T | MG970695 | NR_160606 | – | – | – |
| Roussoella bambusarum | GMBC 0316 T | ON479892 | ON479891 | – | ON505017 | ON505012 |
| Roussoella guttulata |
|
MT734818 | MT734821 | – | MW022188 | MW022187 |
| Rubroshiraia bambusae | HKAS 102255 T | MK804658 | MK804678 | MK804704 | MK819218 | – |
| Rubroshiraia bambusae | HKAS 102256 | MK804659 | MK804679 | MK804705 | MK819219 | – |
| Salsuginea phoenicis |
|
MK405280 | – | – | MK404650 | – |
| Salsuginea ramicola | KT 2597.2 | GU479801 | – | GU479768 | GU479862 | GU479834 |
| Salsuginea rhizophorae |
|
MN017851 | – | MN017917 | – | – |
| Seltsamia ulmi | CBS 143002 T | MF795794 | MF795794 | MF795794 | MF795882 | MF795836 |
| Septoriella chlamydospora |
|
KU163654 | KU163658 | KU163655 | – | – |
| Septoriella hibernica | CBS 145371 T | MK540036 | MK539966 | – | – | MK540097 |
| Setoarthopyrenia chromolaenae |
|
MT214438 | MT214344 | MT214392 | MT235768 | MT235805 |
| Shiraia bambusicola | GZAAS 2.0708 T | KC460982 | GQ845414 | – | – | – |
| Shiraia bambusicola | HKAS 102267 | MK804657 | MK804677 | MK804703 | MK819217 | MK819237 |
| Sporormurispora atraphaxidis |
|
MG829083 | MG828971 | MG829183 | – | – |
| Sporormurispora paulsenii |
|
MK966143 | – | MK963075 | – | MN023029 |
| Stagonospora forlicesenensis |
|
KX655547 | KX655557 | KX655552 | KX655562 | – |
| Stagonospora imperaticola |
|
KY706133 | KY706143 | KY706138 | KY706146 | KY706149 |
| Stemphylium clematidis |
|
MT214583 | MT310628 | MT226696 | – | – |
| Stemphylium carpobroti | CPC 38637 T | MW175395 | MW175355 | – | – | – |
| Striatiguttula nypae |
|
MK035992 | MK035969 | MK035977 | MK034432 | MK034440 |
| Striatiguttula phoenicis |
|
MK035995 | MK035972 | MK035980 | MK034435 | MK034442 |
| Subglobosporium tectonae |
|
KU764703 | KU712445 | KU712464 | – | KU712485 |
| Subglobosporium tectonae |
|
KU764702 | KU712446 | KU712463 | – | KU712495 |
| Sublophiostoma thailandica |
|
KX534212 | MW136257 | KX534218 | KX550077 | MW088714 |
| Sublophiostoma thailandica |
|
KX534216 | MW136275 | KX534222 | KX550080 | MW088718 |
| Submersispora variabilis |
|
MN913682 | MT627683 | MT864310 | – | – |
| Submersispora variabilis | N-KR15 | MZ538561 | MZ538527 | MZ538575 | MZ567103 | MZ567114 |
| Sulcatispora acerina | HHUF 30449 T | LC014610 | LC014597 | LC014605 | LC014615 | – |
| Sulcatispora berchemiae | HHUF 29097 T | AB807534 | AB809635 | AB797244 | AB808509 | – |
| Sulcosporium thailandica |
|
KT426563 | MG520958 | KT426564 | – | – |
| Teichospora trabicola | C134 T | KU601591 | KU601591 | – | KU601601 | KU601600 |
| Tetraploa aquatica |
|
MT530452 | MT530448 | – | – | – |
| Tetraploa aquatica |
|
MT530453 | MT530449 | MT530454 | – | – |
| Thyridaria acaciae | CBS 138873 T | NG_058127 | KP004469 | – | – | – |
| Thyridaria broussonetiae | CBS 141481 T | KX650568 | KX650568 | KX650515 | KX650539 | KX650586 |
| Thyrostroma jaczewskii |
|
MK765857 | MK765856 | MK765858 | – | – |
| Torula camporesii | KUMCC 19-0112 T | MN507402 | MN507400 | MN507401 | MN507403 | MN507404 |
| Torula pluriseptata |
|
KY197855 | MN061338 | KY197862 | KY197875 | KY197869 |
| Trematosphaeria grisea | CBS 332.50 T | NG_057979 | NR_132039 | NG_062930 | KF015698 | KF015720 |
| Trematosphaeria pertusa | CBS 122368 T | NG_057809 | NR_132040 | FJ201991 | KF015701 | FJ795476 |
| Tubeufia abundata (Tubeufiales) |
|
MH558894 | MH558769 | – | MH550961 | MH551095 |
| Tubeufia aquatica (Tubeufiales) |
|
KY320539 | KY320522 | – | KY320556 | MH551142 |
| Tubeufia hainanensis (Tubeufiales) | GZCC 22-2015 T | OR030835 | OR030842 | – | OR046679 | OR046685 |
| Tubeufia hainanensis (Tubeufiales) | GZCC 23-0589 | OR066421 | OR066414 | – | OR058860 | OR058853 |
| Tzeanania taiwanensis | NTUCC 17-005 T | MH461120 | MH461123 | MH461126 | MH461130 | MH461128 |
| Tzeanania taiwanensis | NTUCC 17-006 | MH461121 | MH461124 | MH461127 | MH461131 | MH461129 |
| Wicklowia aquatica | CBS 125634 T | MH875044 | OM322822 | GU266232 | – | GU371813 |
| Wicklowia fusiformispora | N-KR1 T | MZ538567 | MZ538533 | MZ538576 | MZ567108 | – |
| Xenomassariosphaeria clematidis |
|
MT214571 | MT310616 | – | MT394630 | – |
| Xenomassariosphaeria rosae |
|
MG829092 | – | MG829192 | – | – |
| Xenopyrenochaetopsis pratorum | CBS 445.81 T | GU238136 | MH861363 | NG_062792 | – | KT389671 |
| Xiuguozhangia broussonetiae |
|
PQ137419 | PQ137417 | PQ137421 | PQ488461 | PQ488459 |
| Xiuguozhangia broussonetiae |
|
PQ137420 | PQ137418 | PQ137422 | – | PQ488460 |
| Zopfia rosatii | CBS 427.62 T | NG_066246 | NR_160090 | – | – | – |
Single gene datasets were aligned using MAFFT version 7 by applying the default setting (https://mafft.cbrc.jp/alignment/server/) (
Bayesian inference (BI) was carried out in MrBayes on XSEDE (version 3.2.7a) in the online CIPRES Portal (https://www.phylo.org/portal2) (
To corroborate the phylogenetic placement and evolutionary relationships of the new taxon, intra- and inter-generic genetic distances were computed in MEGA-X by applying the Kimura 2-parameter substitution model, gamma distribution, and pairwise deletion options (
Blast searches of LSU, ITS, SSU, TEF1 and RPB2 sequences indicated that the two isolates are highly similar to various genera in Pleosporales, including Atrocalyx, Hermatomyces, Lophiotrema and Pseudoberkleasmium.
Dataset 1 consisted of 4250 characters (LSU = 1–846, ITS = 847–1355, SSU = 1356–2359, TEF1 = 2360–3257, and RPB2 = 3258–4250), which was analysed to depict relationships at a higher taxonomic level for Xiuguozhangia (Fig.
Maximum likelihood analysis (IQ-tree) based on a combined dataset of LSU, ITS, SSU, TEF1, and RPB2 sequences of all families (with representative genera) of Pleosporales. Bootstrap support values (ML ≥ 80%) and Bayesian posterior probabilities (PP ≥ 0.95) are given above the branches or near the nodes as ML/PP. Hyphens (--) indicate bootstrap support values below 80% for ML and posterior probabilities below 0.95. The tree is rooted with Tubeufia abundata (
Dataset 2 comprised 4285 characters (LSU = 1–833, ITS = 834–1344, SSU = 1345–2350, TEF1 = 2351–3272, and RPB2 = 3273–4285), and was used to infer the inter-generic relationships of Xiuguozhangia, which comprised multiple strains for each genus (Fig.
Maximum likelihood analysis (IQ-tree) based on the combined LSU, ITS, SSU, TEF1 and RPB2 sequences of Xiuguozhangia, Pseudoberkleasmium and Hermatomyces, generated from dataset 2. Bootstrap support values (ML ≥ 80%) and Bayesian posterior probabilities (PP ≥ 0.95) are given above the branches or near the nodes as ML/PP. Hyphens (--) indicate bootstrap support values below 80% for ML and posterior probabilities below 0.95. The tree is rooted with Anteaglonium gordoniae (
The two strains of Xiuguozhangia broussonetiae (
Based on the generic relationship depicted in Figs
Group mean genetic distances (%) in Hermatomyces spp., Pseudoberkleasmium spp., and Xiuguozhangia spp. across ITS (511 bp) and LSU (833 bp).
| DNA markers | Groups | Group 1: Hermatomyces spp. | Group 2: Pseudoberkleasmium spp. |
|---|---|---|---|
| ITS | Group 1: Hermatomyces spp. | 0 | – |
| Group 2: Pseudoberkleasmium spp. | 9.052 | 0 | |
| Group 3: Xiuguozhangia spp. | 10.62834205 | 13.25008949 | |
| LSU | Group 1: Hermatomyces spp. | 0 | – |
| Group 2: Pseudoberkleasmium spp. | 3.1615 | 0 | |
| Group 3: Xiuguozhangia spp. | 4.1404 | 3.8669 |
The specific epithet refers to the host genus, Broussonetia, from which the species was isolated.
Saprobic on decaying stems of Broussonetia papyrifera. Sexual morph not observed. Asexual morph on substrate. Hyphomycetous. Colonies on the substrate effuse, hairy, olivaceous to dark brown, appearing velvety due to numerous conidiophores. Mycelium semi-immersed or immersed, composed of septate, branched, smooth, hyaline or pale brown to brown hyphae. Conidiophores (430–)550–750(–890) µm long (x– = 681 µm, n = 10), 15–24(–34) µm wide (x– = 21.8 µm, n = 10) at the base, 11–14(–16) µm wide (x– = 12.3 µm, n = 10) in the middle, 7–10 µm(–12) wide (x– = 7.8 µm, n = 10) at the apex, rarely branched, macronematous, mononematous, differentiated, smooth, thick-walled, erect, straight or flexuous, brown to dark brown, wider at the base and ocasionally conical at the apex, comprising 12–17 septa. Conidiogenous cells 5–12 µm long × 4–9 µm wide (x– = 7.4 × 6.2 µm, n = 10), holoblastic, enteroblastic, integrated, smooth-walled, ovoid to ampulliform, hyaline or brown to dark brown, occurring terminally or intercalary on conidiophores, with up to four successive percurrent proliferations, with new conidiogenous cells developing on subtending cells. Conidia 25–40 µm long × 30–60 µm wide (x– = 35 × 47 µm, n = 30), width measured between the two extremities of the apices, solitary, dictyospored and cheirospored, fan-shaped to cheiroid, lenticular in edge view, occasionally apically 2–3-lobed, dark brown to olivaceous brown, dictyoseptate, with up to 15 columns of cells radiating from a protuberant basal cell 2–3 µm wide, septa obscured by dark pigmentation, and with 1–3 apical appendages (rarely without appendages). Apical appendages (2–)6–16(–20) µm long (x– = 10.9 µm, n = 10), 4–5 µm wide (x– = 4.4 µm, n = 10) at the base, 4–5 µm wide (x– = 4.1 µm, n = 10) at the apex, mostly short and untapered, sometimes long and tapering, arising from the sides of the outermost rows of cells of the conidium, pale brown to brown, becoming hyaline and rounded at the tips, and consisting of 1–5 septa.
On PDA, colony circular with lobate to crenated margin, reaching 25 mm diam. after 28 days incubated at 25 °C, greyish white to olivaceous brown from center to edge, fluffy, raised to convex, penetrating the media and displaying a dark brown colour around the media.
Thailand • Chiang Rai Province, Mae Fah Luang University Botanical Garden, on decaying stems of Broussonetia papyrifera (Moraceae), 19 May 2023, D. Gomdola, F2-A (
Thailand • Chiang Rai Province, Mae Fah Luang University Botanical Garden, on decaying stems of Broussonetia papyrifera (Moraceae), 19 May 2023, D. Gomdola, F2-B (
Our two isolates (
Xiuguozhangia broussonetiae (
A close comparison of the morphological characters across the existing Xiuguozhangia species is collated and presented in Table
Phenotypic comparison of Xiuguozhangia species. Features that depict X. broussonetiae from other Xiuguozhangia species are in bold.
| Species and characters | X. appendiculata | X. broussonetiae | X. indica | X. macrospora | X. punicae | X. rhaphidophorae | X. rosae | |
| Colonies on the natural substrates | Features | Effuse, hairy | Effuse, appearing velvety due to numerous conidiophores | Effuse, hairy | Effuse, hairy, growing in association with species of lichen | Effuse, hairy | Effuse, hairy | Effuse, hairy |
| Colour | Olivaceous to dark brown | Olivaceous to dark brown | Olivaceous to dark brown | Olivaceous to dark brown | Olivaceous to dark brown | Olivaceous to dark brown | Olivaceous to dark brown | |
| Conidiophores | Size (µm) | Up to 620 µm long, 18–35 µm wide at the base, 13–18 µm wide in the middle, 7–11.5 µm wide at the apex | (430–)550–750(–890) µm long, 15–24(–34) µm wide at the base, 11–14(–16) µm wide in the middle, 7–10 µm(–12) wide at the apex | Up to 530 µm long, 13–15 µm wide at the base, 10–12 µm wide in the middle, 3.6–5 µm wide at the apex | 160–340(–570) µm long, 12–21 µm wide at the base, 11–14 µm wide in the middle, 6–7.5 µm wide at the apex | Up to 550 µm long, 20–30 µm wide at the base, 10–17 µm wide in the middle, 5–8 µm wide at the apex | Up to 630 µm long, 18–25 µm wide at base, 10–15 µm wide in the middle, 4–7 µm wide at apex | Up to 730 µm long, 12–20 µm wide at the base, 7–14 µm wide in the middle, 5–9 µm wide at the apex |
| Features | Mononematous, erect, straight or flexuous, unbranched, smooth, thick-walled, comprising 4–8 septa | Macronematous, mononematous, erect, straight or flexuous, rarely branched, smooth, thick-walled, wider at the base and ocasionally conical at the apex, comprising 12–17 septa | Mononematous, basal portion sheath-like, erect, straight, unbranched, smooth, thick-walled, comprising 4–13 septa | Mononematous, erect, straight, unbranched, smooth, thick-walled, comprising 3–8 septa | Macronematous, mononematous, erect, straight or flexuous, unbranched, smooth, thick-walled, comprising 5–11 septa | Macronematous, mononematous, erect, straight or flexuous, unbranched, smooth, thick-walled, comprising 10–15 septa | Macronematous, mononematous, erect, straight or flexuous, unbranched, smooth, thick-walled, comprising 8–14 septa | |
| Colour | Dark brown | Brown to dark brown | Brown, becoming paler towards the apex | Brown | Not mentioned | Not mentioned | Not mentioned | |
| Conidiogenous cells | Size (µm) | Not mentioned | 5–12 µm long, 4–9 µm wide | 7.5–13.5 × 4.2–7.4 µm | 9–19 × 7.5–10.0 µm | Not mentioned | Not mentioned | Not mentioned |
| Features | Holoblastic, integrated, terminal, sometimes lateral, truncate after conidium secession | Holoblastic, enteroblastic, integrated, terminal or intercalary, smooth-walled, ovoid to ampulliform, percurrently proliferating; sometimes new condiogenous cells developing on subtending cells | Flask-shaped, integrated, terminal and lateral, truncate after conidial secession, proliferating percurrently up to 4 times | Flask-shaped, integrated, terminal, truncate after conidial secession, proliferating percurrently up to 5 times | Monotretic, integrated, terminal, sometimes lateral, with up to five successive percurrent proliferations | Monotretic, integrated, terminal and lateral | Monotretic, integrated, terminal and lateral, with up to three successive percurrent proliferations | |
| Colour | Not mentioned | Hyaline or brown to dark-brown | Brown | Brown | Not mentioned | Not mentioned | Not mentioned | |
| Conidia | Size (µm) | 50–80 µm long, 60–90 µm wide | 25–40 µm long, 30–60 µm wide | 34–44 µm long, 39–52 µm wide | (73–)81–120(–135) µm long, (51–)67–94(–106) µm wide | 50–65 µm long, 58–95 µm wide | 27–41 µm long, 30–43 µm wide | 45–50 µm long, 53–76 µm wide |
| Features | Fan-shaped, lenticular in edge view, 2–3-lobed, dictyoseptate, with rows of cells radiating from a protuberant basal cell 6–7.5 µm wide | Dictyospored and cheirospored, fan-shaped to cheiroid, lenticular in edge view, occasionally apically 2–3-lobed, dictyoseptate, with up to 15 columns of cells radiating from a protuberant basal cell 2–3 µm wide | Fan-shaped, sometimes 2–5-lobed, lenticular in edge view, dictyoseptate, with up to 15 rows of cells, basal cell protuberant, 3.7–5 µm wide | Campanulate or fan-shaped, sometimes apically 2–3-lobed, lenticular in edge view, dictyoseptate, smooth, with up to 18 vertical rows of cells, basal cell protuberant, 7–9 µm wide | Fan-shaped, sometimes 2–3-lobed, lenticular in edge view, dictyoseptate, with up to 18 rows of cells radiating from a protuberant basal cell 4.5–6.5 µm wide | Fan-shaped, sometimes lobed, lenticular in edge view, dictyoseptate, with eight rows of cells radiating from a protuberant basal cell 2.5–5 µm wide | Fan shaped, sometimes 2–3-lobed, lenticular in edge view, dictyoseptate, with 20 rows of cells radiating from a protuberant basal cell 3–5 µm wide | |
| Colour | Dark brown | Dark brown to olivaceous brown | Brown | Brown | Dark brown | Dark brown | Dark brown | |
| Apical appendage(s) | Size (µm) | 75–120 µm long, 4–6 µm wide, tapering to 1.5–2 µm wide | (2–)6–16(–20) µm long, 4–5 µm wide at the base and apex | 15–30 µm long, 3–4.4 µm wide at the base, tapering to 2.4–2.8 µm wide | (33–)52–74(–126) µm long, 6.5–8.0 µm wide at the base | 24–99 µm long, 3–5.5 µm wide, tapering to 1–1.5 µm wide | 15–35 µm long, 3–4 µm wide, tapering to 2–3 µm wide | |
| Features | 2–4 appendages, tapering, 3–5-septate | Without or with 1–3 appendages, rounded at the tips, mostly untapered, sometimes tapering 1–5-septate | 2 appendages (Up to 4), tapering, 1–2-septate | 2–3 appendages (rarely up to 4), tapering, 1–3(–6)-septate | 2 appendages (rarely up to 3), smooth, tapering, 0–3-septate | Appendages absent | 2 appendages, tapering, 1–2-septate | |
| Color | Brown, and apically hyaline | Pale brown to brown, becoming hyaline at the tips | Brown, and apically hyaline | Brown, and apically hyaline | Brown, and apically hyaline | - | Brown, and apically hyaline | |
| Host(s) | On dead twigs of an unknown host | On decaying stems of Broussonetia papyrifera | On dried bamboo culms | On dead bamboo stem | On dead branches of Punica granatum | On dead branches of Rhaphidophora decursiva | On dead branches of Rosa chinensis | |
| Distribution(s) | India | Thailand | India | India | China | China | China | |
| References | ( |
This study |
|
|
|
|
|
|
A summary of the main findings from the morphological assessment is presented below:
Based on these morphological differences, we conclude that our taxon is distinct from the existing Xiuguozhangia species.
The number of hyphomycetes introduced over the past decade has increased substantially, indicating that their diversity is rather high (
There are more than 30,000 fungal species that exhibit the asexual morph, belonging to 2265 hyphomycetous genera (
In the phylogenetic analysis of dataset 1, which included representative taxa from all families of Pleosporales, Xiuguozhangia forms a sister lineage to Pseudoberkleasmium, with maximum statistical support in both methods of analysis (Fig.
Xiuguozhangia is sister to Pseudoberkleasmium and closely related to Hermatomyces (Figs
The characterisation of Xiuguozhangia as a separate genus from Pseudoberkleasmium is further corroborated based on their distinct features. Xiuguozhangia differs from Pseudoberkleasmium in their colonies on natural substrates, and conidiophore, conidiogenous cell and conidial features (
With respect to the inter-species morphological differences in the genus, the new species, X. broussonetiae, differs from all extant species (Table
Due to the limited taxon sampling and analysis, and the lack of comprehensive DNA sequence data, there remains uncertainty in using conidial ontogeny as a basis for distinguishing Xiuguozhangia from Piricaudiopsis. As such, we refrain from drawing further conclusions regarding their taxonomic separation at this stage. Instead, a more effective approach would involve extensive sampling across diverse localities and habitats, particularly those that support the growth of hyphomycetes. Coupled with a systematic acquisition of DNA sequence data, these efforts would provide a more robust support for classifying Xiuguozhangia species and other poorly studied Pleosporalean taxa (
We thank Dr Shaun Pennycook for suggesting and validating the nomenclature of the new species. Deecksha Gomdola thanks the Mae Fah Luang University for providing the MFU student scholarship 2020 (reference: GR-ST-FS-63-06) to pursue to PhD program, and for allocating the thesis writing grant [reference: 7702(6)/201 (No.0275)]. Deecksha Gomdola thanks the Mushroom Research Foundation (MRF) for partly funding her project, and the staffs of the MFU botanical garden for their help in the sample collection and identification of the host. Deecksha Gomdola also thanks Prof. Dr. Yong Wang of the Guizhou University (Department of Plant Pathology) for providing funds to conduct molecular work under his NFSC grant No. 31972222. We would also like to acknowledge the grant GDPX[2019]13 for partly funding this project. We thank Miss Tang Xia and Mr. Xingguo Tian for providing conidial images of Hermatomyces and Pseudoberkleasmium to complement Fig.
The authors have declared that no competing interests exist.
No ethical statement was reported.
This work was supported by Guizhou University (NFSC grant No. 31972222 and GDPX[2019]13), Mae Fah Luang University, Mushroom Research Foundation and MFU student scholarship 2020 (reference: GR-ST-FS-63-06); thesis writing grant [reference: 7702(6)/201 (No.0275)]; Researchers Supporting Project number (RSP2024R114).
Conceptualization: DG, EG, RJ. Data curation: DG. Formal analysis: DG. Funding acquisition: YW. Investigation: DG. Methodology: DG. Resources: YW, FA, KDH. Software: DG. Supervision: KDH, YW, RSJ. Validation: RSJ, YW, RJ, FA, KDH, EG. Visualization: DG. Writing - original draft: DG. Writing - review and editing: RSJ, YW, RJ, KDH, EG.
Deecksha Gomdola https://orcid.org/0000-0002-0817-1555
Rajesh Jeewon https://orcid.org/0000-0002-8563-957X
Eleni Gentekaki https://orcid.org/0000-0002-3306-6714
Ruvishika S. Jayawardena https://orcid.org/0000-0001-7702-4885
Kevin D. Hyde https://orcid.org/0000-0002-2191-0762
Fatimah Alotibi https://orcid.org/0000-0003-3629-5755
All data generated or analysed during this study are included in this published article.