Dematiohelicomyces helicosporus (Boonmee, Y.Z. Lu & K.D. Hyde) Y.Z. Lu, Fungal Diversity 92: 159 (2018)
Basionym: Chlamydotubeufia helicospora Boonmee, Y.Z. Lu & K.D. Hyde, Fungal Diversity 80: 123 (2016)
Index Fungorum number: IF 554825; Facesoffungi number: FoF 04702
Etymology: ‘helicospora’ referring to asexual helicospores.
Holotype: MFLU 16-1338
Saprobic on woody substrate. Mycelium partly immersed, partly superficial, white, septate, sparsely branched hyphae, with masses of crowded conidia. Sexual morph: Undetermined. Asexual morph: Conidiophores 15–25 μm long × 4–6 μm wide (x̄ = 18 × 5 μm, n = 10), pale brown, macronematous, erect, short, smooth-walled. Conidiogenous cells 11–33 μm long × 4–5 μm wide (x̄ = 18 × 4.5 μm, n = 10), monoblastic, integrated, each with single conidium. Conidia 63–119 μm diam. and conidial filament 5–7 μm wide (x̄ = 80 × 6 μm, n = 20), 405–546 μm long, loosely coiled 1–2.5 times, rounded at apical end, up to 68-septate, slightly constricted at septa, hyaline, smooth-walled. (Hyde et al. 2016)
Culture characteristics: Conidia germinating on water agar (WA) within 8 h and germ tubes produced from conidia. Colonies on malt extract agar (MEA) reaching 4 mm in 1 week at 28 °C, brown to dark brown. Mycelium superficial and partially immersed, branched, septate, hyaline to pale brown, smooth.
Material examined: THAILAND, Uttaradit, Laplae, Mae Phun, Ban Ton Klua, on decaying wood in flowing freshwater stream, 24 October 2015, Saranyaphat Boonmee, UTD15–1 (MFLU 16-1338, holotype, BBH 41053, isotype); ex-type living culture, MFLUCC 16-0213, TBRC.
Notes: Notes: This taxon was introduced as Chlamydotubeufia helicospora by Hyde et al. (2016). Morphologically, it resembles to Helicomyces torquatus and H. hyalosporus in having short conidiophores with 0–3-septate, and helicoid conidia with a spathulate basal end cell, but can be distinguished by its pale brown conidiophores, and narrower and loose helicoid conidia. Based on morphology and phylogeny, we synonymize this taxon under Dematiohelicomyces helicosporus. (Notes from Lu et al. 2018)
Freshwater distribution: Thailand (Hyde et al. 2016; Lu et al. 2018)