Research Article |
Corresponding author: María Teresa Telleria ( telleria@rjb.csic.es ) Academic editor: Kentaro Hosaka
© 2017 María Teresa Telleria, Margarita Dueñas, María P. Martín.
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:
Telleria MT, Dueñas M, Martín MP (2017) The genus Hydnophlebia (Polyporales, Basidiomycota) with description of three new species from the Macaronesian Islands. MycoKeys 27: 39-64. https://doi.org/10.3897/mycokeys.27.14866
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The genus Hydnophlebia includes two species of wood-inhabiting fungi, Hydnophlebia chrysorhizon and Hydnophlebia omnivora. Both are characterized by cream to reddish-orange, resupinate basidiome, with hydnoid hymenophore, margin with strands, a monomitic hyphal system, tubular to ventricose cystidia and elliptical spores. In this paper, a taxonomic study of Hydnophlebia, using morphology and molecular analyses of large subunit nuclear ribosomal DNA (LSU) and the internal transcribed spacer nrDNA operon (ITS), is reported. Three new species, Hydnophlebia canariensis, H. gorgonea and H. meloi, from the Macaronesia bioregion (Canary Islands and Cape Verde Archipelago), are described.
Agaricomycetes , corticioid fungi, phylogeny, taxonomy, Canary Islands, Cape Verde Archipelago
Hydnophlebia was erected by
During our survey of corticioid fungi from Macaronesia (Canary Islands and Cape Verde Archipelago), nine hydnoid specimens were initially identified as belonging to the genus Phanerochaete. Blast search of the large subunit of the nrDNA (LSU) sequences showed high similarity with a sequence published in
The aim of this study was to characterize and classify our specimens from Macaronesia, using morphological data and molecular analyses of LSU and ITS regions.
Specimens were collected in the Canary Islands and Cape Verde Archipelago (Table
Specimens of Hydnophlebia species described as new, and EMBL/GenBank/DDBJ and UNITE accessions included in the LSU and ITS nrDNA analyses. The asterisk (*) after the taxon names denotes type species of the genus. The specimens with uncertain generic placement are listed at the end of the table; in Fig.
Names after our LSU or ITS analyses | Names included in EMBL/GenBank/DDBJ and UNITE | Isolate/Voucher | GenBank/UNITE accessions | |
---|---|---|---|---|
LSU | ITS | |||
Abortiporus biennis* | Abortiporus biennis | KEW210 | AF287842 | – |
Cabaladontia queletii* | Phlebia queletii |
|
AF141626 | – |
Ceriporia viridans* | Ceriporia viridans | FO24398 | AJ406518 | |
Ceriporiopsis gilvescens* | Ceriporiopsis gilvescens | O/Haussknecht98 | DQ144618 | – |
Climacodon septentrionalis* | Climacodon septentrionalis | HHB-13438-sp | AF518610 | – |
Crustodontia chrysocreas* | Phlebia chrysocreas | FPL-6080 | AY293199 | – |
Crustodontia chrysocreas* | Phlebia chrysocreas |
KHL10216 ( |
AY586695 | – |
Cymatoderma elegans* | Cymatoderma elegans | Halling9064 (NY) | JN649341 | – |
Hydnophlebia canariensis | Hydnophlebia canariensis | 17035Tell., MA-Fungi 86622, Holotype | KF528103 | KF483012 |
Hydnophlebia canariensis | Hydnophlebia canariensis | 17038Tell., MA-Fungi 86623 | KF528104 | KF483013 |
Hydnophlebia canariensis | Hydnophlebia canariensis | 17674Tell., MA-Fungi 86619 | KF528100 | KF483009 |
Hydnophlebia chrysorhizon* | Phanerochaete chrysorhizon | FP-102002-sp ( |
– | AY219359 |
Hydnophlebia chrysorhizon* | Phanerochaete chrysorhizon | T-484, RGT 871020/12 | AF139967 | – |
Hydnophlebia chrysorhizon* | Hydnophlebia chrysorhizon | T 484 | – | KP135335 |
Hydnophlebia chrysorhizon* | Hydnophlebia chrysorhizon | FP-134985 | – | KP135336 |
Hydnophlebia chrysorhizon* | Hydnophlebia chrysorhizon | HHB-18767 | – | KP135337 |
Hydnophlebia chrysorhizon* | Hydnophlebia chrysorhizon | FD-282 | – | KP135338 |
Hydnophlebia gorgonea | Hydnophlebia gorgonea | 13327MD, MA-Fungi 86642 | KF528122 | KF483031 |
Hydnophlebia gorgonea | Hydnophlebia gorgonea | 19110Tell., MA-Fungi 86658 | KF528139 | KF483048 |
Hydnophlebia gorgonea | Hydnophlebia gorgonea | 19111Tell., MA-Fungi 86659, Holotype | KF528140 | KF483049 |
Hydnophlebia gorgonea | Hydnophlebia gorgonea | 19133Tell., MA-Fungi 86664 | KF528145 | KF483054 |
Hydnophlebia meloi | Hydnophlebia meloi | 19071Tell., MA-Fungi 86654, Holotype | KF528135 | KF483044 |
Hydnophlebia omnivora | Phanerochaete omnivora | HHB-5969-sp | – | AY219360 |
Hydnophlebia omnivora | Hydnophlebia omnivora 2a | ME-497 | – | KP135332 |
Hydnophlebia omnivora | Hydnophlebia omnivora 2a | HHB-6228-sp | – | KP135333 |
Hydnophlebia sp. 1 | Hydnophlebia omnivora 1a | KKN-112-sp | – | KP135334 |
Hydnophlebia sp. 2 | Phlebia sp. | TU108437 | – | UDB016816 |
Junghuhnia crustacea* | Junghuhnia crustacea | X1127, O. Miettinen 13852,1 (H) | JN710554 | – |
Junghuhnia crustacea* | Junghuhnia crustacea | X262, O. Miettinen 2954,1 (H) | JN710553 | – |
Lamelloporus americanus* | Lamelloporus americanus | X670, T. Laessoe 10119 (O, H) | JN710567 | – |
Lilaceophlebia livida* | Phlebia livida |
|
AF141624 | – |
Merulius tremellosus* | Phlebia tremellosa | FPL-4294 | AY293200 | – |
Merulius tremellosus* | Phlebia tremellosa |
|
AF141632 | – |
Merulius tremellosus* | Phlebia tremellosa | F15198 (UBC) | DQ384584 b,c | DQ384584 b,c |
Merulius tremellosus* | Phlebia tremellosa |
|
– | GU731568 |
Mycoacia fuscoatra* | Mycoacia fuscoatra |
KHL13275 ( |
JN649352 | JN649352 |
Mycoacia fuscoatra* | Phlebia subserialis | KUC8041, culture | AY858370 | |
Mycoacia nothofagi | Mycoacia nothofagi | KHL13750 | GU480000 | – |
Mycoacia nothofagi | Phlebia nothofagi | AH31887 | GQ259416 | – |
Mycoacia nothofagi | Phlebia nothofagi | KHL13750 | GU226430 | – |
Mycorrhaphium adustum* | Mycorrhaphium adustum |
KHL12255 ( |
JN710573 | – |
Mycoaciella bispora* | Mycoaciella bispora | EL13_99 | AY586692 | – |
Phlebia acerina | Phlebia acerina |
|
AF141615 | – |
Phlebia radiata* | Phlebia radiata | culture? | AB325676 | – |
Phlebia radiata* | Phlebia radiata | FCUG2423, culture | AF141627 | – |
Phlebia radiata* | Phlebia radiata | FPL6140 | AF287885 | – |
Phlebia radiata* | Phlebia radiata | GEL5258 | AJ406541 | – |
Phlebia radiata* | Phlebia radiata | KUC8034, culture | AY858369 | – |
Phlebia radiata* | Phlebia radiata | TM03_491 | EU522844 | – |
Phlebia radiata* | Phlebia radiata | JLL-15608-sp. ( |
– | AY219366 |
Phlebia radiata* | Phlebia radiata |
|
– | EF491867 |
Phlebia rufa | Phlebia rufa | FCUG 2397 | AF141628 | – |
Scopuloides hydnoides* | Scopuloides hydnoides |
KHL11916 ( |
EU118665 c | EU118665 c |
Scopuloides hydnoides* | Scopuloides hydnoides | GEL3859 | AJ406573 | – |
Scopuloides hydnoides* | Scopuloides hydnoides | GEL3139 | AJ406574 | – |
Steccherinum ochraceum* | Steccherinum ochraceum |
KHL11902 ( |
JQ031130 | – |
Steccherinum ochraceum* | Steccherinum ochraceum | Ryberg sn. ( |
EU118670 | – |
Specimens “incertae sedis” | Mycoacia aurea | GEL5339 | AJ406535 | – |
Mycoacia aurea | NH14434 | AY586691 | – | |
Phlebia setulosa | PH106520, culture | GU461311 | – | |
Phlebia setulosa | PH11749, culture | GU461312 | – | |
Phlebia setulosa | PH5105, culture | GU461313 | – | |
Phlebia setulosa | AH31879 | GQ259417 | – | |
Phlebia subochracea | FCUG 1161, culture | AF141630 | – | |
Phlebia subochracea | KGN 162/95 ( |
EU118656 b | EU118656 b | |
Phlebia suserialis | FCUG1434, culture | AF141631 | – | |
Phlebiella griseofulva | GEL4492 | AJ406517 | – |
Genomic DNA was extracted from eight collections (Table
Total DNA was used for PCR amplification of the D1−D2 region of the large subunit (LSU) and the internal transcribed spacer region (ITS) of the nuclear ribosomal gene. The primers LR0R (
Negative controls lacking fungal DNA were run for each experiment to check for contamination. The reactions were run with the following parameters for the LSU nrDNA: initial denaturation at 94 °C for 5 min, then 36 cycles of denaturation at 94 °C for 30 s, annealing at 52 °C for 30 s, and extension at 72 °C for 1.5 min, with a final extension at 72 °C for 10 min, and 4 °C soak; for the ITS nrDNA: initial denaturation at 95 °C for 5 min, then 5 cycles of denaturation at 95 °C for 30 s, annealing at 54 °C for 30 s, and extension at 72 °C for 1 min, followed by 33 cycles of denaturation at 72 °C for 1 min, annealing at 48 °C for 30 s, and extension at 72 °C, with a final extension at 72 °C for 10 min and 4 °C soak.
PCR products were checked on 2% agarose D1 low EEO (CONDA, PronadisaTM) gels and subsequently purified using the QIAquick Gel PCR Purification (QIAGEN) kit according to the manufacturer’s instructions. The purified PCR products were sequenced using the same amplification primers at Macrogen Korea (Seoul, Korea).
Sequencher v. 4.2 (Gene Codes Corporation, Ann Arbor, MI) was used to edit the resulting electropherograms and to assemble contiguous sequences (Table
The LSU and ITS sequences obtained were aligned separately using Se-Al v. 2.0a11 Carbon (
To infer phylogenetic relationships of Macaronesian specimens within Meruliaceae, the LSU sequences were compared with homologous sequences retrieved from the EMBL/GenBank/DDBJ databases (
A maximum parsimony analysis (MP) was carried out; minimum length Fitch trees were constructed using heuristic searches with tree-bisection-reconnection (TBR) branch swapping, collapsing branches if maximum length was zero and with the MulTrees option on in PAUP*4.0b10 (
For molecular characterization of the Macaronesian specimens, the ITS sequences were compared with homologous sequences retrieved from the EMBL/GenBank/DDBJ (
Based on our previous phylogenetic trees obtained from LSU, two sequences of Phlebia radiata Fr. were selected as outgroup (AY219366, EF491867). Alignment gaps were marked “–”, unresolved nucleotides and non-sequenced nucleotide positions within the data matrix were indicated with “N”. A maximum parsimony analysis (MP) was carried out under heuristic search, following the same criteria as mentioned above for LSU; maximum likelihood (ML) and Bayesian approaches were also performed, using the GTR+I+G as selected by PAUP*Version 4.0b10 and MrModeltest 2.3. The ML and Bayesian analyses were done with the same programs, and followed the same criteria as mentioned above for LSU.
Alignments and phylogenetic trees have been deposited at TreeBase: http.//purl.org/phylo/tree-base/phylows/study/TB2:S21012
Sixteen new sequences from the Macaronesian specimens were generated in this study (Table
The LSU dataset contains 57 sequences and 908 aligned positions, of which 682 were constant, 82 parsimony uninformative, and 144 parsimony-informative. Maximum parsimony analysis yielded 100 most parsimonious trees (613 steps long, CI = 0.4731, HI = 0.6164, RI = 0.7399) under a heuristic search. Almost identical tree topologies were generated after parsimony and Bayesian analyses. The 50% majority-rule consensus tree from the Bayesian analysis is shown in Fig.
The 50% majority rule Bayesian tree inferred from D1-D2 LSU nrDNA assuming the GTR + I + G model of corticioid fungi included in Table
All sequences obtained from Macaronesian specimens cluster in a supported clade (MP-BS = 70%, ML-BS = 80 %, PP = 1.0), with sequences from
The ITS nrDNA dataset contains 26 sequences and 851 aligned positions, of which 575 were constant, 103 parsimony uninformative, and 173 parsimony-informative. After heuristic search, the 100 trees had 447 steps, CI = 0.7136, HI = 0.3798 and RI = 0.7831. Almost identical tree topologies were generated after parsimony (data not shown), maximum likelihood (data not shown) and Bayesian analyses. The 50% majority-rule consensus tree from the Bayesian analysis is shown in Fig.
The 50% majority rule Bayesian tree inferred from ITS nrDNA assuming the GTR + I + G model of corticioid fungi included in Table
Similar to the LSU analyses, the sequences from Macaronesian specimens form a clade (MP-BS = 76%, ML-BS = 75%, PP = 1.0), together with downloaded sequences of Hydnophlebia from the USA (Arizona, Florida, Illinois, New York and Puerto Rico) and Canada, identified in
The five sequences from Canada and the USA identified as H. chrysorhizon grouped in a highly supported clade (MP-BS > 80%, ML-BS > 82%, PP = 1.0). The sequences UDB016816, labelled Hydnophlebia sp. 2 from Madagascar, and KP135339, labelled Hydnophlebia sp. 3 (H. cf. chrysorhizon in
The new sequences generated for this work are distributed over three clades. These clades are here described in the order they occur from top to bottom in Fig.
The first group (MP-BS = 100%, ML-BS = 100%, PP = 1.0) contains sequences of 17035Tell., 17038Tell., and 17674Tell. from El Hierro and Fuerteventura Islands, collected on different substrates.
A second clade (MP-BS > 75%, ML-BS > 82%, PP = 1.0) encloses specimen 19071Tell., from Fogo Island, collected on Sarcostemma daltonii Decne (Asclepiadaceae), and the sequence indicated in Fig.
Sequences of 13327MD, 19110Tell., 19111Tell., and 19133Tell., all from São Vicente Island on Prosopis juliflora (Sw.) DC. (Fabaceae), are distributed in a third clade (MP-BS = 100%, ML-BS = 99%, PP = 1.0).
Hydnum chrysorhizon Torr. in Eaton, Manual Bot.: 309. 1822
Basidioma resupinate, separable, generally reddish orange yellow. Hymenophore hydnoid, with aculei up to 0.5–1.5 mm long, conical to cylindrical. Margin with strands. Hyphal system monomitic with scattered clamps, subicular and strand hyphae thick-walled, colorless to yellowish, encrusted, aculei and subhymenial hyphae thin-walled, also colorless. Cystidia cylindrical to ventricose, colorless, thin-walled, sometimes few. Basidia cylindrical to subclavate, with 4 sterigmata, basal clamp absent. Spores cylindrical, ellipsoid to subglobose, smooth, thin-walled.
1 | Spores narrowly ellipsoid to cylindrical, 4−6 × 2−3 µm (L/W = 1.9). Basidiome orange brown in dry specimens, reddish orange to deep orange in fresh material. Strands very long, yellowish to cream in dry material and reddish orange in fresh specimens, up to 1 mm diam | 2. H. chrysorhizon |
– | Spores ellipsoid, broadly ellipsoid or subglobose (L/W ≤ 1.6) | 2 |
2 | Spores subglobose, 4−5.5 × 3−4 µm (L/W = 1.2). Basidiome yellowish white to pale orange-yellow in dry specimens. Margin fimbriate, yellowish white, with strands poorly developed. Cystidia cylindrical, 40−55 × 3−4 µm | 4. H. meloi |
– | Spores ellipsoid to broadly ellipsoid (L/W ≥ 1.3) | 3 |
3 | Basidiome in small and poorly developed patches, cream-coloured in dry specimens. Clamps present in strand hyphae. Cystidia cylindrical slightly tapered at the apex, 40−70 × 4−5 µm. Spores ellipsoid, 5−6.5 × 3−4 µm (L/W = 1.6) | 5. H. omnivora |
– | Basidiome broadly effuse, orange-yellow to brilliant orange-yellow. Clamps absent in strand hyphae | 4 |
4 | Basidiome light orange-yellow in dry specimens. Margin fimbriate, with white, well developed strands. Cystidia of two types, cylindrical with slightly tapered apex and ventricose with subulate apex, 45−55 × 3−5 µm. Spores ellipsoid, 5−7 × 3−4.5 µm (L/W = 1.5) | 1. H. canariensis |
– | Basidiome light to brilliant orange-yellow in dry specimens. Margin fimbriate with poorly developed strands. Cystidia cylindrical, sometimes capitate, to ventricose, 45−55 × 4−6 µm. Spores ellipsoid to broadly ellipsoid, 5−7 × 4−4.5 µm (L/W = 1.4) | 3. H. gorgonea |
This species can be recognized by the orange-yellow basidiome, hydnoid hymenophore with long aculei, up to 1,5 mm, white subiculum, and well-developed white strands. Spores ellipsoid 5−7 × 3−4.5 µm (L/W = 1.5).
Named after the Canary Islands where the holotype and paratypes were collected.
Basidiome resupinate, effuse, membraneous to ceraceous, yellow (82. v. Y) in fresh specimens and light orange-yellow (70. l. OY) in dry. Hymenophore hydnoid, aculei conical, 0.5−1.5 mm long. Subiculum byssoid, white. Margin fimbriate, white, with well-developed white strands.
Hyphal system monomitic; subicular hyphae 6−8 µm wide, with clamps, thin to thick-walled; strand hyphae 7−11 µm wide, without clamps, thick-walled; aculei hyphae 4−5 µm wide, without clamps, thin-walled and growing perpendicular to the substrate; subhymenial hyphae 3−4 µm wide, without clamps, thin-walled, and loosely interwoven. Cystidia of two types: cylindrical with slightly tapered apex and ventricose with subulate apex, thin-walled, 45−55 × 3−5 µm. Basidia cylindrical to subclavate, 24−28 × 4−6 µm, with 4 sterigmata, basal clamp absent. Spores ellipsoid 5−7 × 3−4.5 µm (L/W = 1.5), thin-walled, colorless, smooth.
Hydnophlebia canariensis. a, b Collection 17035Tell., MA-Fungi 86622, holotype, basidiome, wet (a) and hymenophore, dry specimen (b) c Collection 17038Tell. MA-Fungi 86623, basidiome, dry specimen. Hydnophlebia chrysorhizon. Collection NY, lectotype d Basidiome, dry specimen e Hymenophore, dry specimen f Strands, dry specimen. Scale bars: a, e = 5 mm; b = 1.5 mm; c, d, f = 1 cm.
Hydnophlebia canariensis. Collection 17035Tell., MA-Fungi 86622, holotype a Hymenophore b Vertical section through an aculei c Subicular hyphae d Strand hyphae e Aculei hyphae f Subhymenial hyphae, cystidia, and basidia g Spores. Scale bars: a = 1 mm; b = 25 µm; c–g = 10 µm. Drawing by M. Dueñas.
On decayed wood and plant debris in arid and semiarid habitats; known only from the Canary Islands.
Spain. Canary Islands: El Hierro, Frontera, Sabinar de la Dehesa, 27°44'43"N; 18°07'02"W, 610 m alt., on unidentified wood, 26 January 2007, M.T. Telleria, 17038Tell. (MA-Fungi 86623), LSU sequence KF528104, ITS sequence KF483013. Fuerteventura, Pájara, Parque Natural de Jandía, Valle de los Mosquitos, 28°04'36"N; 14°25'23"W, 99 m alt., on Launaea arborescens, 05 December 2007, M.T. Telleria, 17674Tell. (MA-Fungi 86619), LSU sequence KF528100, ITS sequence KF483009.
Hydnum chrysorhizon Torr. in Eaton, Manual Bot.: 309. 1822
USA, Hydnum chrysorhizon Torr. in Eaton Man. 3ed. p. 309. 237, C. C., Steward. In herbarium NY! (lectotype, designated by
Basidiome resupinate, effuse, membraneous, easily separable, orange-brown in dry specimens, reddish orange to deep orange in fresh material (
Hyphal system monomitic; subicular hyphae 7−10 µm wide, with clamps, thick-walled, colorless to pale yellow, densely encrusted with colorless crystals and loosely interwoven; strand hyphae 10−17 µm wide, without clamps, thick-walled, colorless, also encrusted; aculei hyphae 4−6 µm wide, with scattered clamps, thin-walled, colorless, and oriented perpendicular to the substrate; subhymenial hyphae 5−7 µm wide, without clamps, thin-walled, colorless, densely interwoven, short-celled. Cystidia not seen, but according to
On decayed wood. Described from New York (
USA. Ohio, Hamilton Co. Sharon Woods County Park, on Quercus sticks, 13 October 1973, W.B. & V.G. Cooke 48958. New York, New Dorp, Staten Island, 17 October 1896, col. L.M. Underwood.
This species has very long and well-developed strands and, microscopically, it is the only species in the genus with spores narrowly ellipsoid to cylindrical (L/W = 1.9) and scattered clamps in the aculei hyphae.
Based on morphological analyses,
Morphologicaly this species is similar to Hydnophlebia canariensis, but can be distinguished by the strands, well developed in H. canariensis and poorly so in H. gorgonea. Spores ellipsoid to broadly ellipsoid 5−7 × 4−4.5 µm (L/W = 1.4).
Named after Gorgades, an ancient name for the Cape Verde Islands, Atlantic Ocean.
Basidiome resupinate, effuse, membraneous, easily separable, light orange-yellow (70. l. OY) to brilliant orange-yellow (67. brill. OY). Hymenophore hydnoid, aculei conical, 0.6−1 mm long. Margin fimbriate, white, with poorly developed strands.
Hyphal system monomitic; subicular hyphae 6−8 µm wide, with clamps, thin- to thick-walled, loosely interwoven, hyaline, encrusted with colorless crystals; strand hyphae 12−15 µm wide, without clamps, thick-walled, sometimes gelatinous and also encrusted; aculei hyphae 3.5−4.5 µm wide, without clamps, thin-walled, colorless, growing perpendicular to the substrate; subhymenial hyphae 4.5−8 µm wide, without clamps, thin-walled, colorless, loosely interwoven, and short- to long-celled. Cystidia cylindrical to ventricose, sometimes capitate, thin-walled, 45−55 × 4−6 µm. Basidia cylindrical to subclavate, 22−24 × 6−8 µm, with 4 sterigmata, basal clamp absent. Spores ellipsoid to broadly ellipsoid 5−7 × 4−4.5 µm (L/W = 1.4), thin-walled, colorless, smooth.
Hydnophlebia gorgonea. a Collection 19111Tell., MA-Fungi 86659, holotype, basidiome, dry specimen b Collection 19133Tell., MA-Fungi 86664, basidiome, dry specimen. Hydnophlebia meloi c, d Collection 19071Tell., MA-Fungi 86654, holotype, basidiome, dry specimen (c), and margin and strands, dry specimen (d). Hydnophlebia omnivora e Collection 5267 C.R. Shear coll., BPI, holotype f Basidiome, dry specimen. Scale bars: a–b = 5 mm; c–d, f = 2 mm; e = 10 mm.
Hydnophlebia gorgonea. Collection 19111Tell., MA-Fungi 86659, holotype a Hymenophore b Vertical section through an aculei c Subicular hyphae d Strand hyphae e Aculei hyphae f Subhymenial hyphae, cystidia, and basidia g Spores. Scale bars: a = 1 mm; b = 25 µm; c–g = 10 µm. Drawing by M. Dueñas.
This species is known from only two localities of São Vicente Island, Cape Verde Archipelago, on decayed wood of Phoenix atlantica and Prosopis juliflora in arid habitats.
Cape Verde. São Vicente: Mindelo, Ribeira da Vinha, 16°51'49"N 25°00'09"W, 10 m alt., on Prosopis juliflora, 26 September 2010, M.T. Telleria, 19110Tell. (MA-Fungi 86658), LSU sequence KF528139, ITS sequence KF483048; M. Dueñas, 13327MD (MA-Fungi 86642), LSU sequence KF528122, ITS sequence KF483031. São Vicente: Ermida, 16°50'26"N; 24°57'23"W, 100 m alt., on Prosopis juliflora, 26 September 2010, M.T. Telleria, 19133Tell. (MA-Fungi 86664), LSU sequence KF528145, ITS sequence KF483054.
Similar to Hydnophlebia omnivora but differs in having subglobose spores, 4−5.5 × 3−4 µm (L/W = 1.2), instead of ellipsoid, 5−6.5 × 3−4 µm (L/W = 1.6). This is the only species in the genus with subglobose spores.
Named after Ireneia Melo, colleague and friend, Portuguese mycologist from the Botanical Garden of the University of Lisbon.
Basidiome resupinate, effuse, membraneous to ceraceous, yellowish white (92. y White) to pale orange-yellow (73. p. OY) in dry specimens. Hymenophore hydnoid, aculei conical, 0.5−1 mm long, in dried specimens usually broken. Margin fimbriate, yellowish white, with strands.
Hyphal system monomitic; subicular hyphae 6−7.5 µm wide, with clamps, thick-walled, loosely interwoven; strand hyphae 6−7.5 µm wide, with clamps occasionally double, thick-walled, sometimes encrusted with colorless crystals; aculei hyphae 3.5−4.5 µm wide, without clamps, thin-walled, growing perpendicular to the substrate; subhymenial hyphae 3.5−4.5 µm wide, without clamps, thin-walled, loosely interwoven, short- to long-celled. Cystidia cylindrical, thin-walled, 40−55 × 3−4 µm. Basidia cylindrical to subclavate, 18−26 × 5−7 µm, with 4 sterigmata, basal clamp absent. Spores subglobose 4−5.5 × 3−4 µm (L/W = 1.2), thin-walled, colorless, smooth.
Hydnophlebia meloi. Collection 19071Tell., MA-Fungi 86654, holotype a Hymenophore b Vertical section through an aculei c Subicular hyphae d Strand hyphae e Aculei hyphae f Subhymenial hyphae, cystidia, and basidia g spores. Scale bars: a = 1 mm; b = 25 µm; c–g = 10 µm. Drawing by M. Dueñas.
Rocky steep slopes, on Sarcostemma daltonii, endemic climbing herb of Cape Verde Archipelago. Only known from the type locality in Fogo Island.
Cape Verde. Fogo: Mosteiros, Miradouro, 15°01'41"N; 24°19'13"W, 283 m alt., on Sarcostemma daltonii, 24 September 2010, M.T. Telleria, 19072Tell. (MA-Fungi 90746).
Hydnum omnivorum Shear, J. Agric. Res. 30: 476. 1925
USA, C.L.S. Type on Osage Orange [Macura pomifera], near Paris, Texas. C.R. Shear coll. Sept. 1903, no. 5267. In herbarium BPI! (holotype).
Basidiome effuse in small and poorly developed patches, cream-coloured in dry specimens. Hymenophore, according to
Hyphal system monomitic; subicular hyphae 8–11 µm wide, with clamps occasionally double, thick-walled, loosely interwoven; strand hyphae 5–9 µm wide, with a few clamps, thick-walled, colorless; aculei hyphae 4−5 µm wide, without clamps, thin-walled, growing perpendicular to the substrate; subhymenial hyphae 5−6 µm wide, without clamps, thin-walled, densely interwoven, short-celled. Cystidia cylindrical, slightly tapered to apex, thin-walled, 40−70 × 4−5 µm. Basidia cylindrical to subclavate, 17−21× 6−7 µm, with 4 sterigmata, basal clamp absent. Spores ellipsoid, 5−6.5 × 3−4 µm (L/W = 1.6), thin-walled, colorless, smooth.
Hydnophlebia omnivora. Collection 5267 C.R. Shear coll., BPI, holotype a Hymenophore b Vertical section through an aculei c Subicular hyphae d Strand hyphae e Aculei hyphae f Subhymenial hyphae, cystidia, and basidia g Spores. Scale bars: a = 1 mm; b = 25 µm; c–g = 10 µm. Drawing by M. Dueñas.
Described from Texas (
Molecular analyses indicate that this species is related to H. meloi. Morphologically they can be distinguised by the shape and size of spores, subglobose 4−5.5 × 3−4 µm in H. meloi, and ellipsoid 5−6.5 × 3−4 µm in H. omnivora.
In this study a taxonomic analysis of Hydnophlebia, based on morphological and molecular data, is provided. Hydnophlebia has been confused with Phanerochaete and the two species included, Hydnophlebia chrysorhizon and Hydnophlebia omnivora, were assigned to the latter genus (
For a long time, Hydnophlebia was considered a monospecific genus; however, based on the molecular analyses, both LSU and ITS sequences, as well as a point-by-point comparison of the morphological characters, five species can be discriminated, two already described by other authors (H. chrysorhizon and H. omnivora), and the three new species from Macaronesia described here (H. canariensis, H. gorgonea, and H. meloi).
Moreover our results show that three other species could be described, although more collections should be analysed: 1) Hydnophlebia sp. 1 under H. omnivora 1 in
Financial support was provided by dgict projects CGL2012-35559, CGL2015-67459-P. We are grateful to reviewers for comments and suggestions to improve the final version. Also to Marian Glenn for checking the English, to Fátima Durán (RJB/CSIC) for providing technical assistance, and to the curators of BPI and NY herbaria for their invaluable assistance.