Xylomyces
Xylomyces Goos, R.D. Brooks & Lamore, Mycologia 69(2): 282 (1977).
Index Fungorum number: IF 10460; Facesoffungi number: FoF 07690, 8 morphological species (Species Fungorum 2022), 2 species with molecular data.
Hyphomycetous. Sexual morph: Unknown. Asexual morph: Colonies on natural substrate thin, effused, mycelium immersed and superficial, composed of branched, septate, dark anastomosing hyphae. Conidiophores and conidia lacking. Chlamydospores abundant, intercalary, solitary, or in chains of 2 to 5, occasionally branched, with 5–9 -septate, constricted at the septa, fusiform, brown to blackish (adapted from Goos et al. 1977).
Type species: Xylomyces chlamydosporus Goos, R.D. Brooks & Lamore
Notes: Xylomyces is characterised by effused mycelium, with abundant chlamydospores that are intercalary, solitary or in chains of 2 to 5, sometimes branched, with 5 to 9 septa. Conidiophores and conidia are lacking. Goh et al. (1997) described four Xylomyces species from submerged wood in freshwater streams. The teleomorph of Xylomyces is unknown. Campbell et al. (2007) referred Xylomyces to Jahnulales based on the wide-ranging mycelium and molecular evidence but no link has been established to a specific Jahnula species. Sivichai et al. (2011) reported that single ascospore isolates of J. aquatica produced Xylomyces chlamydosporus and confirmed the connection between Jahnula species and the asexual morphic genus Xylomyces. Xylomyces is currently a polyphyletic genus in Aliquandostipitaceae and not all species belong to Jahnulales. More collections with DNA sequence data and more gene region are needed to confirm the status of the genus. Molecular markers available for Xylomyces are ITS, LSU and SSU.
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