Research Article |
Corresponding author: Hong Yu ( hongyu@ynu.edu.cn ) Academic editor: Cecile Gueidan
© 2022 Weiqiu Zou, Dexiang Tang, Zhihong Xu, Ou Huang, Yuanbing Wang, Ngoc-Lan Tran, Hong Yu.
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:
Zou W, Tang D, Xu Z, Huang O, Wang Y, Tran N-L, Yu H (2022) Multigene phylogeny and morphology reveal Ophiocordyceps hydrangea sp. nov. and Ophiocordyceps bidoupensis sp. nov. (Ophiocordycipitaceae). MycoKeys 92: 109-130. https://doi.org/10.3897/mycokeys.92.86160
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Ophiocordyceps species have a wide range of insect hosts, from solitary beetle larva to social insects. However, among the species of Ophiocordyceps, only a few attack cicada nymphs. These species are mainly clustered in the Ophiocordyceps sobolifera clade in Ophiocordyceps. A new entomopathogenic fungus parasitic on cicada nymphs, and another fungus parasitic on the larva of Coleoptera, are described in this study. The two new species viz. Ophiocordyceps hydrangea and Ophiocordyceps bidoupensis were introduced based on morphology and multigene phylogenetic evidence. The phylogenetic framework of Ophiocordyceps was reconstructed using a multigene (nrSSU, nr LSU, tef-1α, rpb1, and rpb2) dataset. The phylogenetic analyses results showed that O. hydrangea and O. bidoupensis were statistically well-supported in the O. sobolifera clade, forming two separate subclades from other species of Ophiocordyceps. The distinctiveness of these two new species was strongly supported by both molecular phylogeny and morphology.
2 new taxa, entomopathogenic fungi, morphology, phylogenetic analyses
Ophiocordyceps G.H. Sung, J.M. Sung, Hywel-Jones & Spatafora is the largest genus in the Ophiocordycipitaceae, comprising approximately 290 species. It was originally established by Petch, with Ophiocordyceps blattae Petch as the type species (
There are fewer species in the O. sobolifera clade than in the Hirsutella clade and the O. sphecocephala clade. The O. sobolifera clade is statistically well-supported in most studies and 11 species have been described in the Index Fungorum (
Ophiocordyceps species have a wide range of insect hosts, from solitary beetle larvae to social insects. More than 10 insect orders were attacked, including Hemiptera, Coleoptera, Lepidoptera, Blattaria, Dermaptera, Diptera, Hymenoptera, Isoptera, Megaloptera, and Mantodea (
Cordyceps s.l. is globally distributed with the highest species diversity recorded in subtropical and tropical regions (
Several studies have evaluated the taxonomy and biology of entomopathogenic fungi, especially species found in China and Southeast Asia. In this study, one unknown species of Ophiocordyeps attacking a cicada nymph was collected from Yunnan Province, Jinghong City, Nabanhe National Nature Reserve, in China. Another unknown species of Ophiocordyeps attacking larvae of Elateridae was collected from Lintong Province, Bidoup Nuiba National Park, in Vietnam. The phylogeny and morphology of these two fungi were determined, and their systematic position was established in Ophiocordycipitaceae. The phylogenetic analyses results showed that the two new species belonged to Ophiocordyceps, and were named Ophiocordyceps hydrangea and Ophiocordyceps bidoupensis based on well-supported morphology and molecular data.
The specimens were collected from China and Vietnam, and the collection site information was noted, including altitude, longitude, latitude, and habitat type. Samples were placed in sterilized tubes or plastic bags and boxes, returned to the laboratory, and stored at 4 °C. The specimens were photographed using a Canon 750 D camera (Canon Inc., Tokyo, Japan). The size was measured, and characteristics were recorded including length of the stroma, single or multiple, length and width of stipe clavate and fertile parts, shape, texture, and color. To obtain axenic cultures, the segments were removed from insect bodies, and these segments were placed onto Potato Dextrose Agar (PDA) consisting of peptone and yeast powder (potato 100 g/500 mL, dextrose 10 g/500 mL, agar 10 g/500 mL, yeast powder 5 g/500 mL, peptone 2.5 g/500 mL) plates. The plates were placed in a culture room at 25 °C until isolated into pure cultures. The cultures were saved on a PDA slant (to grow slowly), and stored at 4 °C. All specimens were deposited in the Yunnan Herbal Herbarium (YHH) of Yunnan University. The extypes of the two species were deposited in the Yunnan Fungal Culture Collection (YFCC) of Yunnan University.
To describe the sexual morphs of the two species, frozen sections or hand sections of the fruiting structures of the stroma were immersed in water and then dyed with lactophenol cotton blue solution for morphological observation and photomicrography (
Five-centimeter segments from the stroma of fresh specimens and the cultures were used for DNA extraction to ensure the cultures and specimens were the same. Total DNA was extracted using cetyltrimethyl ammonium bromide (CTAB) according to the procedure described by
Sequences of the five genes (nrSSU, nr LSU, tef-1α, rpb1, and rpb2) were downloaded from GenBank, and combined with the newly generated sequences in this study. The taxa information of the species and GenBank accession numbers of the five genes are listed in Table
Specimen information and GenBank accession numbers of the sequences used in this study.
Species | Host | Isolate no./ specimen no. | GenBank accession no. | ||||
---|---|---|---|---|---|---|---|
nrSSU | nr LSU | tef-1α | rpb1 | rpb2 | |||
Hirsutella citriformis | Cixiidae (Hemiptera) | ARSEF 1446 | KM652065 | KM652106 | KM651990 | KM652031 | – |
Hirsutella fusiformis | Brachyderes incanus (Curculionidae, Coleoptera) | ARSEF 5474 | KM652067 | KM652110 | KM651993 | KM652033 | – |
Hirsutella gigantea | Pamphiliidae (Hymenoptera) | ARSEF 30 | – | JX566977 | JX566980 | KM652034 | – |
Hirsutella guyana | Empoasca kraemeri (Cicadellidae, Hemiptera) | ARSEF 878 | KM652068 | KM652111 | KM651994 | KM652035 | – |
Hirsutella illustris | Eriosoma lanigerum (Aphididae, Hemiptera) | ARSEF 5539 | KM652069 | KM652112 | KM651996 | KM652037 | – |
Hirsutella kirchneri | Abacarus hystrix (Eriophyidae, Acari) | ARSEF 5551 | KM652070 | KM652113 | KM651997 | – | – |
Hirsutella lecaniicola | Parthenolecanium corni (Coccidae, Hemiptera) | ARSEF 8888 | KM652071 | KM652114 | KM651998 | KM652038 | – |
Hirsutella liboensis | Larva of Cossidae (Lepidoptera) | ARSEF 9603 | KM652072 | KM652115 | KY415588 | KY945367 | – |
Hirsutella necatrix | Acari | ARSEF 5549 | KM652073 | KM652116 | KM651999 | KM652039 | – |
Hirsutella nodulosa | Dioryctria zimmermani (Pyralidae, Lepidoptera) | ARSEF 5473 | KM652074 | KM652117 | KM652000 | KM652040 | – |
Hirsutella radiata | Diptera | ARSEF 1369 | KM652076 | KM652119 | KM652002 | KM652042 | – |
Hirsutella rhossiliensis | Mesocriconema xenoplax (Criconematidae, Tylenchida) | ARSEF 3747 | KM652080 | KM652123 | KM652006 | KM652045 | – |
Hirsutella strigosa | Nephotettix virescens (Cicadellidae, Hemiptera) | ARSEF 2197 | KM652085 | KM652129 | KM652012 | KM652050 | – |
Hirsutella subulata | Microlepidoptae (Lepidoptera) | ARSEF 2227 | KM652086 | KM652130 | KM652013 | KM652051 | – |
Hirsutella thompsonii var. synnematosa | Aceria sheldoni (Eriophyidae, Acari) | ARSEF 2459 | KM652099 | KM652147 | KM652027 | KM652061 | – |
Hirsutella thompsonii var. thompsonii | Phyllocoptruta oleivora (Eriophyidae, Acari) | ARSEF 137 | KM652087 | KM652131 | KM652014 | KM652052 | – |
Hirsutella thompsonii var. vinacea | Acalitus vaccinii (Eriophyidae, Acari) | ARSEF 254 | KM652101 | KM652149 | KM652028 | KM652062 | – |
Ophiocordyceps acicularis | Larva of Coleoptera | OSC 110987 | EF468950 | EF468805 | EF468744 | EF468852 | – |
Ophiocordyceps acicularis | Larva of Coleoptera | OSC 110988 | EF468951 | EF468804 | EF468745 | EF468853 | – |
Ophiocordyceps agriotidis | Larva of Coleoptera | ARSEF 5692 | DQ522540 | DQ518754 | DQ522322 | DQ522368 | DQ522418 |
Ophiocordyceps annulata | Larva of Coleoptera | CEM 303 | KJ878915 | KJ878881 | KJ878962 | KJ878995 | – |
Ophiocordyceps aphodii | Larva of Scarabaeidae (Coleoptera) | ARSEF 5498 | DQ522541 | DQ518755 | DQ522323 | – | DQ522419 |
Ophiocordyceps appendiculata | Larva of Coleoptera | NBRC 106960 | JN941728 | JN941413 | AB968577 | JN992462 | AB968539 |
Ophiocordyceps arborescens | Larva of Pueraria lobata (Lepidoptera) | NBRC 105891 | AB968386 | AB968414 | AB968572 | – | AB968534 |
Ophiocordyceps bidoupensis | Larva of Elateridae (Coleoptera) | YFCC 8793 | OM304638 | – | OK556894 | OK556898 | OK556900 |
Ophiocordyceps bidoupensis | Larva of Elateridae (Coleoptera) | YHH 20036 | OK571396 | – | OK556893 | OK556897 | OK556899 |
Ophiocordyceps brunneanigra | Cicadellidae (Hemiptera) | TBRC 8093 | – | MF614654 | MF614638 | MF614668 | MF614681 |
Ophiocordyceps brunneaperitheciata | Larva of Lepidoptera | TBRC 8100 | – | MF614658 | MF614643 | – | MF614685 |
Ophiocordyceps brunneipunctata | Larva of Elateridae (Coleoptera) | OSC 128576 | DQ522542 | DQ518756 | DQ522324 | DQ522369 | DQ522420 |
Ophiocordyceps citrina | Hemiptera | TNS F18537 | – | KJ878903 | KJ878983 | – | KJ878954 |
Ophiocordyceps cochlidiicola | Cochlidiidae pupa (Lepidoptera) | HMAS 199612 | KJ878917 | KJ878884 | KJ878965 | KJ878998 | – |
Ophiocordyceps cossidarum | Larva of Cossidae (Lepidoptera) | MFLU 17-0752 | MF398186 | MF398187 | MF928403 | MF928404 | – |
Ophiocordyceps crinalis | Larva of Lepidoptera | GDGM 17327 | KF226253 | KF226254 | KF226256 | KF226255 | – |
Ophiocordyceps evansii | Pachycondyla harpax adult ant (Hymenoptera) | HUA 186159 | KC610796 | KC610770 | KC610736 | KP212916 | – |
Ophiocordyceps formicarum | Formicidae (Hymenoptera) | TNS F18565 | KJ878921 | KJ878888 | KJ878968 | KJ879002 | KJ878946 |
Ophiocordyceps forquignonii | Adult fly (Diptera) | OSC 151902 | KJ878912 | KJ878876 | – | KJ878991 | KJ878945 |
Ophiocordyceps furcatosubulata | Larva of Elateridae (Coleoptera) | YFCC 904 | MT774216 | MT774223 | MT774244 | MT774230 | MT774237 |
Ophiocordyceps furcatosubulata | Larva of Elateridae (Coleoptera) | YHH 17005 | MT774217 | MT774224 | MT774245 | MT774231 | MT774238 |
Ophiocordyceps geometridicola | Larva of Geometridae (Lepidoptera) | TBRC 8095 | – | MF614648 | MF614632 | MF614663 | MF614679 |
Ophiocordyceps houaynhangensis | Larva of Coleoptera | TBRC 8428 | – | MH092902 | MH092894 | – | – |
Ophiocordyceps hydrangea | Nymph of cicada (Hemiptera) | YFCC 8832 | OM304636 | OM304640 | OM831277 | OM831280 | OM831283 |
Ophiocordyceps hydrangea | Nymph of cicada (Hemiptera) | YFCC 8833 | OM304637 | OM304641 | OM831278 | OM831281 | OM831284 |
Ophiocordyceps hydrangea | Nymph of cicada (Hemiptera) | YFCC 8834 | OM304635 | OM304639 | OM831276 | OM831279 | OM831282 |
Ophiocordyceps karstii | Hepialus jianchuanensis (Lepidoptera) | MFLU:15-3884 | KU854952 | – | KU854945 | KU854943 | – |
Ophiocordyceps kimflemingiae | Camponotus castaneus/americanus (Hymenoptera) | SC09B | KX713631 | KX713620 | KX713698 | KX713724 | – |
Ophiocordyceps kniphofioides | Cephalotes atratus adult ant (Hymenoptera) | HUA 186148 | KC610790 | KF658679 | KC610739 | KF658667 | KC610717 |
Ophiocordyceps konnoana | Larva of Coleoptera | EFCC 7315 | EF468959 | – | EF468753 | EF468861 | EF468916 |
Ophiocordyceps langbianensis | Larva of Coleoptera | DL0017 | MT928355 | MT928306 | – | – | – |
Ophiocordyceps lanpingensis | Larva of Hepialidae (Lepidoptera) | YHOS0705 | KC417458 | KC417460 | KC417462 | KC417464 | KC456333 |
Ophiocordyceps longissima | Cicada nymph (Cicadidae, Hemiptera) | NBRC 106965 | AB968392 | AB968420 | AB968584 | – | AB968546 |
Ophiocordyceps longissima | Hemiptera; cicada (nymph) | EFCC 6814 | – | EF468817 | EF468757 | EF468865 | – |
Ophiocordyceps macroacicularis | Larva of Cossidae (Lepidoptera) | NBRC 100685 | AB968388 | AB968416 | AB968574 | – | AB968536 |
Ophiocordyceps multiperitheciata | Lepidoptera larva | BCC 69008 | – | MF614657 | MF614641 | – | MF614682 |
Ophiocordyceps myrmicarum | Hymenoptera (Formicidae) | HIRS 45 | KJ680150 | JX566965 | JX566973 | KJ680151 | – |
Ophiocordyceps nigrella | Larva of Lepidoptera | EFCC 9247 | EF468963 | EF468818 | EF468758 | EF468866 | EF468920 |
Ophiocordyceps pruinosa | Hemiptera | NHJ 12994 | EU369106 | EU369041 | EU369024 | EU369063 | EU369084 |
Ophiocordyceps pseudoacicularis | Larva of Lepidoptera | TBRC 8102 | – | MF614646 | MF614630 | MF614661 | MF614677 |
Ophiocordyceps pulvinata | Camponotus adult ant (Hymenoptera) | TNS-F 30044 | GU904208 | AB721305 | GU904209 | GU904210 | – |
Ophiocordyceps ramosissimum | Phassus nodus larva (Lepidoptera) | GZUHHN8 | KJ028012 | – | KJ028014 | KJ028017 | – |
Ophiocordyceps ravenelii | Beetle larva (Coleoptera) | OSC 110995 | DQ522550 | DQ518764 | DQ522334 | DQ522379 | DQ522430 |
Ophiocordyceps robertsii | Larva of Hepialidae (Lepidoptera) | KEW 27083 | – | EF468826 | EF468766 | – | – |
Ophiocordyceps rubiginosiperitheciata | Larva of Coleoptera | NBRC 106966 | JN941704 | JN941437 | AB968582 | JN992438 | AB968544 |
Ophiocordyceps satoi | Polyrhachis lamellidens (Hymenoptera) | J19 | KX713650 | KX713601 | KX713684 | KX713710 | – |
Ophiocordyceps sinensis | Larva of Hepialidae (Lepidoptera) | EFCC 7287 | EF468971 | EF468827 | EF468767 | EF468874 | EF468924 |
Ophiocordyceps sinensis | Larva of Hepialidae (Lepidoptera) | YHH 1805 | MK984568 | MK984580 | MK984572 | MK984587 | MK984576 |
Ophiocordyceps sobolifera | Cicada nymph (Cicadidae, Hemiptera) | TNS F18521 | KJ878933 | KJ878898 | KJ878979 | KJ879013 | – |
Ophiocordyceps sobolifera | Hemiptera (cicada nymph) | NBRC 106967 | AB968395 | AB968422 | AB968590 | – | – |
Ophiocordyceps spataforae | Hemiptera adult | NHJ 12525 | EF469125 | EF469078 | EF469063 | EF469092 | EF469111 |
Ophiocordyceps sphecocephala | Hymenoptera adult wasp | NBRC 101753 | JN941695 | JN941446 | AB968592 | JN992429 | AB968553 |
Ophiocordyceps stylophora | Larva of Elateridae (Coleoptera) | OSC 110999 | EF468982 | EF468837 | EF468777 | EF468882 | EF468931 |
Ophiocordyceps thanathonensis | Hymenotera adult ant | MFLU 16-2910 | MF882926 | MF850377 | MF872614 | MF872616 | – |
Ophiocordyceps tiputinii | Larva of Megaloptera | QCNE 186287 | KC610792 | KC610773 | KC610745 | KF658671 | – |
Ophiocordyceps tricentri | Adult of Cercopoidea (Hemiptera) | NBRC 106968 | AB968393 | AB968423 | AB968593 | – | AB968554 |
Ophiocordyceps unilateralis s. str. | Camponotus sericeiventris (Hymenoptera) | VIC 44303 | KX713628 | KX713626 | KX713675 | KX713730 | – |
Ophiocordyceps unituberculata | Larva of Lepidoptera | YFCC HU1301 | KY923214 | KY923212 | KY923216 | KY923218 | KY923220 |
Ophiocordyceps xuefengensis | Larva of Phassus nodus (Lepidoptera) | GZUH2012HN14 | KC631789 | – | KC631793 | KC631798 | – |
Ophiocordyceps yakusimensis | Cicada nymph (Cicadidae, Hemiptera) | HMAS 199604 | KJ878938 | KJ878902 | – | KJ879018 | KJ878953 |
Paraisaria amazonica | Adult of Acrididae (Orthoptera) | HUA 186143 | KJ917562 | KJ917571 | KM411989 | KP212902 | KM411982 |
Paraisaria coenomyiae | Coenomyia sp. (Coenomyiidae, Diptera) | NBRC 106964 | AB968385 | AB968413 | AB968571 | – | AB968533 |
Paraisaria gracilis | Larva of Lepidoptera | EFCC 8572 | EF468956 | EF468811 | EF468751 | EF468859 | EF468912 |
Paraisaria heteropoda | Cicada nymph (Hemiptera) | NBRC 100644 | JN941718 | JN941423 | AB968596 | JN992452 | AB968557 |
Tolypocladium inflatum | Coleoptera (larva) | OSC 71235 | EF469124 | EF469077 | EF469061 | EF469090 | EF469108 |
Tolypocladium ophioglossoides | Fungi (Elaphomyces sp.) | CBS 100239 | KJ878910 | KJ878874 | KJ878958 | KJ878990 | KJ878944 |
A total of 83 samples were used for the phylogenetic analyses. Five gene sequences of the two new species collected were used to reconstruct the phylogenetic framework of Ophiocordyceps. Two taxa of Tolypocladium were designated as the outgroup, and these were, respectively, Tolypocladium ophioglossoides CBS 100239 and Tolypocladium inflatum OSC 71235. The alignment lengths of the 83 samples were composed of 4,486 bp sequence data, 971 bp of nrSSU, 921 bp of nr LSU, 943 bp of tef-1α, 726 bp of rpb1, and 925 of rpb2. The phylogenetic tree showed that these were identical in overall topologies to previous studies. Four clades (Hirsutella clade, O. sobolifera clade, O. sphecocephala clade, and O. ravenelii clade) of Ophiocordyceps were well-supported by ML bootstrap proportions and BI posterior probabilities (Fig.
Phylogenetic relationships of Ophiocordyceps hydrangea and related species from the five genes dataset (nr LSU, nrSSU, tef-1α, rpb1, and rpb2) based on ML and BI analyses. Statistical support values of BI posterior probabilities and ML bootstrap proportions (0.5/≥50%) are shown at the nodes.
Hydrangea, referred to the top of the stroma similar to hydrangea.
China, Yunnan Province, Jinghong City, Nabanhe National Nature Reserve, 22°8'21.32"N, 100°42'18.35"E, alt. 612 m, on cicada nymphs (Cicadidae, Hemiptera). The material was found in the soil of an evergreen broad-leaved forest, 18 August 2020, H. Yu (YHH 20081, holotype; YFCC 8834, ex-holotype culture).
The stroma was grown from the head of the host cicada nymph, solitary, the top of the stroma similar to hydrangea, pale pink, 1.6–6.4 cm long. Sexual morph was not observed.
The colony grew slowly on PDA medium. Cultured at 25 °C for about 12 weeks, the diameter of the colony was 25–28 mm, pale pink, the edge white, hard texture. The back of the colony was white to brown. Surface hyphae rough, hyaline, septate. Conidiophores were cylindrical. Conidiogenous cells were solitary or whorled, ampuliform, smooth-walled, forming on conidiophores or colonies, hyaline, with swollen base, and slender top, 10.6–17.6 µm long, 2.9–4.3 µm wide at the swollen base, and 1.1–2.2 µm wide at the slender top. Conidia hyaline, ovoid or long oval, solitary, 6.8–10.1 × 3.3–4.5 µm.
Cicada nymph (Cicadidae, Hemiptera).
In the soil of an evergreen broad-leaved forest.
China.
China, Yunnan Province, Jinghong City, Nabanhe National Nature Reserve, 22°8'21.32"N, 100°42'18.35"E, alt. 612 m, on cicada nymphs (Cicadidae, Hemiptera) was found in the soil an evergreen broad-leaved forest, 18 August 2020, H. Yu (YFCC 8832, YFCC 8833).
Phylogenetic analyses showed that O. hydrangea clustered with O. sobolifera, O. longissima, and O. yakusimensis of the O. sobolifera clade (Fig.
Species | Host | stromata | Perithecia | Asci | Ascospores | Conidiogenous cells | Conidia | References |
---|---|---|---|---|---|---|---|---|
O. bidoupensis | Larva of Elateridae (Coleoptera) | Solitary, solid, cylindrical, yellow, 11.8–22.5 cm long. | Immersed, pyriform to lanceolate, brown-yellow, 213.4–405.9 × 74.8–192.4 μm. | Hyaline, slender, 116.1–192.7 × 4.8–7.5 μm. | Hyaline, filiform, multi-septate. | Cone, hyaline, septate, smooth-walled, forming on hyphae, with a hypertrophic base, tapering abruptly into a thin neck, smooth-walled, 13.8–46.4 × 0.42–5.13 μm. | Oval or briolette, hyaline, smooth-walled, 2.24–3.61 × 1.49–2.70 μm. | This study |
O. brunneipunctata | Larva of Elateridae (Coleoptera) | Solitary, rarely up to 3, simple, 25–90 mm high. | Immersed, perithecioid, brown, ovate to pyriform, brown-walled, 270–335 × 110–160 μm. | Hyaline, cylindric, capitate, 8-spored, 280–295 × 6–7 μm. | Hyaline, filiform, multiseptate breaking into 64 part spores, 4–6 × 1–1.5 μm. | Monophialidic, rarely polyphialidic, hyaline, smooth, 5.5–7.5 × 2.5–3.0 μm at the base, up to 15 × 0.5 μm above. | Hyaline, aseptate, smooth, spherical 1.5–2.5 μm diam., enveloped by a mucous sheath. |
|
O. cossidarum | Larva of Cossidae (Lepidoptera) | Solitary, simple, 40–70 mm high. | Immersed, red, ovate to phialide, red-walled, 355–454 × 136–171 μm. | Hyaline, cylindrical, 8-spored with a thickened apex, 174–221 × 5.7–7 μm. | Hyaline, fifiliform, multiseptate,131–153 × 1.8–2.2 μm, breaking into 32 part-spores. | – | – |
|
O. furcatosubulata | Larva of Elateridae (Coleoptera) | Single, solid, yellow to brown, 40–80 mm long, 1.5–2.2 mm wide. | Immersed, long ovoid or pyriform, 289.6–405.8 × 87.0–159.2 µm. | Hyaline, cylindrical, 138.8–202.5 × 4.3–6.0 μm. | Hyaline, filiform, multi-septate, finally breaking into secondary ascospores, 3.7–5.3 × 1.3–2.0 μm. | Polyphialidic, forming on conidiophores or side branches, hyaline, with a slender or subulate base, tapering gradually, smooth-walled or verruculose, 3.5–15.8 × 0.9–1.7 μm. | Solitary, aseptate, smooth-walled, broadly ellipsoid or ellipsoid, 1.5–2.5 × 1.2–1.9 μm. |
|
O. houaynhangensis | Larva of Coleoptera | Solitary, cylindrical, cream, up to 11 cm long and 1.5–2.5 mm in width. | Completely immersed, obclavate, 300–450 × 80–170 µm. | Cylindrical, 100–250 × 4–7.5 µm. | Hyaline, cylindrical, breaking into 32 small truncate part-spores, 4–7 × 1–2 µm. | Monophialidic, phialides flasked-shaped with long necks, up to 30 µm long and 2–4 µm in breadth; phialide necks up to 18 μm long and 0.5 µm in breadth. | Hyaline, smooth, spherical, 2–3 µm. |
|
O. langbianensis | Larva of Coleoptera | Solitary, rarely branched, 40–100 mm long. | Immersed, ovate or pyriform, 260–400 × 100–190 µm. | Cylindrical, with thickened cap, 200–250 × 5.0–6.0 μm. | Fliform, multiseptate, articulated in long-chain afer discharging, sometimes breaking into 1-celled part spores, 5–7.5 × 1.3–2 µm. | Divergent. | Chains, elliptical. |
|
O. sobolifera | Cicada nymph (Cicadidae, Hemiptera) | Commonly single, rarely fasciculated by twos or threes, arising from head among polster, clavate or cylindric 2–8 cm long, 2–6 mm thick, become hollow after maturity. | Rectangularly immersed, ampullaceous 500–600 × 220–260 μm, with somewhat long neck, ostiola somewhat prominent, walls hyaline 8–16 μm thick. | Cylindric, 400–470 × 5.6–6.3 μm. | Finally breaking into secondary ascospores, truncate at both ends, 6–12 × 1.0–1.3 μm. | – | Terminal or lateral, ellpsoid or fusiformed, hyaline, 6.5–10.5 × 2.5–4.0 μm. |
|
O. yakusimensis | Cicada nymph (Cicadidae, Hemiptera) | Very long attaining 14 cm, arising from the apical part between eyes. | Wholly embeddèd, narrow ovoid or almost naviculate, 740–800 × 170–230 μm, without protruding ostiola, neck almost destitute, wall 21–23 μm thick, composed of very thin cells. | 270–310 × 5 μm. | Finally breaking into secondary ascospores, long cylindrical, somewhat attenuated on both sides, terminally truncate, 10–15 × 1 μm. | – | – |
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longissima | Cicada nymph (Cicadidae, Homoptera) | 5–20 cm long, some times much longer. | Ovoid to long ovoid, with a short neck, 440–590 × 130–300 µm. | 190–350 × 5–6 µm. | – | – | – |
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O. khonkaenensis | Cicada nymph (Hemiptera) | Variable in number, solitary to three, 20–30 mm long and 2–3 mm in breath. | Immersed, flask shaped, 590–700 × 200–300 µm. | Cylindrical, 237.5–337.5 × 5–6 µm. | Filiform, 300–360 × 1–1.5 µm readily breaking into 32 part-spores, 7–13 × 1–1.5 µm. | Phialidic, hirsutella-like, 5.5–11 × 2–3 µm. | Hyaline, fusiform, smoothwalled, 3–5.5 × 1–3 µm. |
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O. hydrangea | Cicada nymph (Cicadidae, Hemiptera) | Solitary, the top of the stroma similar to hydrangea, pale pink,1.6–6.4 cm long. | – | – | – | Solitary or whorled, ampuliform, smooth-walled, forming on conidiophores or colonies, hyaline, with swollen base, and slender top, 10.6–17.6 µm long, 2.9–4.3 µm wide at the swollen base, and 1.1–2.2 µm wide at the slender top. | Hyaline, ovoid or long oval, solitary, 6.8–10.1 × 3.3–4.5 µm. | This study |
Bidoupensis, referred to the type species collected from Bidoup Nuiba National Park.
Vietnam, Lintong Province, Bidoup Nuiba National Park, 12°8'9.30"N, 108°31'51.38"E, alt. 1678 m, on larva of Elateridae (Coleoptera) buried in soil, emerging from the leaf litter on the forest floor, 16 October 2017, H. Yu (YHH 20036, holotype; YFCC 8793, ex-holotype culture).
Ophiocordyceps bidoupensis A–C fungus on an Elateridae larva D, E cross-section of the ascoma showing the perithecial arrangement F–H asci I ascospores J, K colony on PDA medium L–N conidiogenous cells and conidia O conidiogenous cells P, Q conidia. Scale bars: 1 cm (A–C); 200 µm (D); 20 µm (E–H); 10 µm (I); 2 cm (J, K); 5 µm (L–Q).
The stroma grew from the head of the host, solitary, solid, cylindrical, 11.8–22.5 cm long, yellow. Stipe clavate, yellow, curved, 10.7–21.2 cm long, 0.7–0.9 mm wide. Fertile parts cylindrical, yellow, slightly curved, 2.9–11.3 mm long, 0.9–1.6 mm wide. Sterile apices cone, yellow, 2.1–7.2 mm long, 0.2–0.7 mm wide. Perithecia immersed, pyriform to lanceolate, brown-yellow, 213.4–405.9 × 74.8–192.4 μm. Asci hyaline, slender, 116.1–192.7 × 4.8–7.5 μm. Asci cap prominent, capitate, 4.7–6.1 × 3.3–5.4 μm. Ascospores hyaline, filiform, multi-septate.
The colony grew slowly on PDA medium. Cultured at 25 °C for about 6 weeks, the diameter of the colony was 38–45 mm, white, aerial mycelium on the surface, slightly convex. The back of the colony was grayish-white, dark brown in the middle. Surface smooth of hyphae, hyaline, septate. Conidiogenous cells cone, hyaline, septate, smooth-walled, forming on hyphae, with a hypertrophic base, tapering abruptly to a thin neck, 13.80–46.4 × 0.42–5.13 μm. Conidia hyaline, oval or briolette, smooth-walled, 2.24–3.61 × 1.49–2.70 μm.
Larva of Elateridae (Coleoptera).
The hosts were buried in soil, and the stroma were found in the leaf litter on the forest floor.
Vietnam.
Phylogenetic analyses showed that O. bidoupensis was clustered with O. houaynhangensis, O. brunneipunctata, O. langbianensis, O. cossidarum, and O. furcatosubulata of the O. sobolifera clade (Fig.
Ophiocordyceps is the largest genus in the Ophiocordycipitaceae, with a wide range of hosts and various species. At present, more than 290 species of Ophiocordyceps have been reported (
The entomopathogenic fungi whose host is Hemiptera have diverse morphological characteristics. For example, O. nutans (Patouillard) G.H. Sung, J.M. Sung, Hywel-Jones & Spatafora (
Phylogenetic analyses based on the data from five genes showed that our phylogenetic framework of Ophiocordyceps was consistent with previous studies (
The species of O. sobolifera clade had diverse morphological characteristics (Table
Due to the unique geographical locations and climate conditions in China and Vietnam, these areas contain a rich species diversity of Cordyceps s.l. However, our survey of Cordyceps s.l. in China and Vietnam only represented a small portion of the total. More samples of Cordyceps s.l. will continue to be collected in China and Southeast Asia in order to uncover additional undescribed taxa, and revise species with the incorrect classification position of this group.
This work was funded by the National Natural Science Foundation of China (31870017, 32060007).