Tubeufiales » Tubeufiaceae

Helicohyalinum

Helicohyalinum Y.Z. Lu, J.K. Liu & K.D. Hyde, in Lu et al., Fungal Diversity 92: 168 (2018).

Index Fungorum number: IF 554833; Facesoffungi number: FoF 04710, 2 morphological species (Species Fungorum 2022), 2 species with molecular data.

Saprobic on submerged decaying wood. Sexual morph: Unknown. Asexual morph: Hyphomycetous, helicosporous. Colonies on the substratum superficial, effuse, gregarious, hyaline to white. Mycelium composed of partly immersed, partly superficial, septate, hyaline, branched hyphae, with masses of crowded, glistening conidia. Conidiophores macronematous, mononematous, flexuous, cylindrical, unbranched or branched, 0–3-septate, the terminal cell tapering towards apex, inverted funnel at apex, hyaline, smooth-walled. Conidiogenous cells holoblastic, monoblastic, integrated, terminal, cylindrical, tapering towards apex, inverted funnel at apex, hyaline, smoothwalled. Conidia solitary, acrogenous, helicoid, rounded at tip, guttulate, multi-septate, tightly coiled 2–3 times, not becoming loose in water, easily deforming and fracturing, hyaline, smooth-walled (adapted from Lu et al. 2018).

Type species: Helicohyalinum infundibulum Y.Z. Lu, J.K. Liu & K.D. Hyde

Notes: Helicohyalinum is characterised by septate, hyaline mycelium, macronematous, mononematous, flexuous, cylindrical conidiophores, monoblastic, integrated, terminal, cylindrical conidiogenous cells and solitary, acrogenous, helicoid conidia. Helicohyalinum differs from other helicosporous genera in having flexuous, cylindrical, 0–3-septate, hyaline conidiophores with the terminal conidiogenous cells pointed towards apex, having an inverted funnel shape at apex (Lu et al. 2018). Helicohyalinum is phylogenetically closely related to Helicodochium but differs morphologically in conidiophores, conidiogenous cells, as well as the conidial characters. Helicohyalinum is morphologically and phylogenetically a distinct genus in Tubeufiaceae. Molecular markers available for Helicohyalinum in GenBank are ITS, LSU, RPB2 and TEF1.

 

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