Dematiohelicosporum
Dematiohelicosporum Y.Z. Lu, J.K. Liu & K.D. Hyde, in Lu et al., Fungal Diversity 92: 159 (2018).
Index Fungorum number: IF 554826; Facesoffungi number: FoF 04703, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Saprobic on decaying wood. Sexual morph: Unknown. Asexual morph: Hyphomycetous, helicosporous. Colonies on the substratum superficial, effuse, gregarious, brown. Mycelium mostly immersed, partly superficial, composed of branched, septate hyphae, pale brown to brown, with a few of brown conidia. Conidiophores macronematous, mononematous, erect, cylindrical, mostly unbranched, 0–3-septate, pale brown, arising as lateral branches from creeping hyphae, smooth-walled. Conidiogenous cells holoblastic, monoblastic, integrated, terminal, cylindrical, truncate at apex after conidial secession, brown, smooth-walled. Conidia solitary, acrogenous, helicoid, slightly circinate in three dimensions, rounded at apex, truncate at basal cell, basal cell elongated, tapering to ends, indistinctly multi-septate, coiled 4–5 times, becoming loosely coiled in water, guttulate, olivaceous to brown, smooth-walled (adapted from Lu et al. 2018).
Type species: Dematiohelicosporum guttulatum Y.Z. Lu, J.K. Liu & K.D. Hyde
Notes: Dematiohelicosporum is unique in having conidia that are somewhat circinate in three dimensions, visibly verrucose and guttulate, olivaceous to brown. Dematiohelicosporum is morphologically and phylogenetically a distinct and well-defined genus in Tubeufiaceae. Molecular markers available for Dematiohelicosporum are ITS, LSU, TEF-1 and RPB2.
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