Incertae sedis » Eriomycetaceae » Eriomyces

Eriomyces heveae

Eriomyces heveae Huanraluek, Thambugala & K.D. Hyde, in Hyde et al., Fungal Diversity 100: 147 (2020)

Index Fungorum number: IF556539         Facesoffungi number: FoF 06152



Sexual morph: Ascomata 240–380(–445) μm high × 215–325 μm diam., immersed beneath a raised dark brown to black pseudoclypeus, papilla erumpent through host surface, solitary or aggregated, scattered, black, coriaceous, unilocular, subglobose to flask-shaped, or conical, with a raised neck. Ostiole central, papillate, periphysate. Peridium 30–56 μm wide, comprising several layers of heavily pigmented to hyaline, thick-walled, cells of textura epidermoidea, fusing at the outside with the host cells. Hamathecium composed of 1–3 μm wide, numerous, rarely septate, branched or unbranched, cellular pseudoparaphyses. Asci 52–102 × 9–13 μm ( = 80 × 10.2 μm, n = 20), poly-spored, bitunicate, cylindrical to cylindric-clavate, with a long to short, narrow, thin-walled, furcate pedicel, apically broadly rounded. Ascospores 4.5–6.5 × 1–2 μm ( = 5.5 × 1.4 μm, n = 50), crowded, ellipsoidal, aseptate, straight to slightly curved, hyaline, smooth-walled, with bipolar guttules. Asexual morph: Undetermined.


Culture characteristics: Ascospores germinating on PDA within 24 h and germ tubes produced from one end. Colo- nies growing on PDA reaching 25 mm diam. after 12 days at 25 °C, circular, falt, slightly dense, surface white to iron- grey, reverse brownish to smoke-grey, white at the margin, smooth surface with entire to slightly curled edge.


Host and habitat: On dead twigs of Hevea brasiliensis Müll. Arg. (Hyde et al. 2020)


Known host and distribution: Thailand


Material examined: THAILAND, Sukhothai Province, Si Satchanalai District, on dead twigs of Hevea brasiliensis (Euphorbiaceae), 2 January 2017, N. Huanraluek, Sh1 (MFLU 18-0758, holotype); ibid., KUN-HKAS 97497, iso- type, ex-type living culture MFLUCC 17-2232.


GenBank Accession No: ITS: MH118116, LSU: MH109524.


Notes: Based on a megablast search of NCBIs GenBank nucleotide database using LSU sequences of strain MFLUCC 17-2232, the closest hit was Pseudopassalora gouriqua (CPC 1811; 95.47% similarity), followed by Heleiosa barbatula (JK 5548I; 95.70% similarity). In the present phylogeny, Eriomyces heveae shows a close affinity to Heleiosa barbatula. Nevertheless, Eriomyces heveae differs from Heleiosa barbatula in having poly-spored asci and hyaline, oblong to allantoid, aseptate ascospores (Kohlmeyer et al. 1996). In addition, H. barbatula was described from Juncus roemerianus Scheele (Juncaceae) in salt marshes of the USA east coast, while Eriomyces heveae was reported from Hevea brasiliensis in Thailand. Therefore, considering the distinct morphological traits and phylogeny E. heveae is introduced as a new species. Ascospores of Eriomyces morphologically resemble those of Cytospora Ehrenb. and Eutypella (Nitschke) Sacc. in Sordariomycetes.

































Figure X. Eriomyces heveae (MFLU 18-0758, holotype). a Appearance of ascomata on host surface. b, c Vertical sections through ascomata. d Vertical sections through the apex of ascoma. e Peridium. f Pseudoparaphyses. g–j Asci. k–o Ascospores p Germinating ascospore. Scale bars: b, c = 50 µm, d, e = 25 µm, f–j = 20 µm, p = 10 µm, k–o = 5 µm.






Hyde KD, Dong Y, Phookamsak R, Jeewon R, Bhat DJ, Jones EB, Liu NG, Abeywickrama PD, Mapook A, Wei D, Perera RH (2020) Fungal diversity notes 1151–1276: taxonomic and phylogenetic contributions on genera and species of fungal taxa.

Kohlmeyer J, Volkmann-Kohlmeyer B, Eriksson OE (1996) Fungi on Juncus roemerianus. 8. New bitunicate ascomycetes. Can J Bot 74:1830–1840.


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project entitled:

"The future of specialist fungi in a changing climate: baseline data for generalist and specialist fungi associated with ants Rhododendron species and Dracaena species"

(Grant No. DBG6080013)

"Impact of climate change on fungal diversity and biogeography in the Greater Mekong Sub-region"

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  • Chinese Academy of Sciences,
  • Honghe County 654400, Yunnan, China

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