Helicoarctatus
Helicoarctatus Y.Z. Lu, J.C. Kang & K.D. Hyde, in Lu et al., Fungal Diversity 92: 165 (2018).
Index Fungorum number: IF 554830; Facesoffungi number: FoF 04707, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Saprobic on submerged decaying wood. Sexual morph: Unknown. Asexual morph: Hyphomycetous, helicosporous. Colonies on the substratum superficial, effuse, gregarious, white. Mycelium composed of partly immersed, partly superficial, brown to dark brown, septate, branched hyphae, with masses of crowded, glistening conidia. Conidiophores macronematous, mononematous, setiform, cylindrical, unbranched, septate, tapering towards apex, brown to dark brown, smooth-walled. Conidiogenous cells holoblastic, mono- to polyblastic, determinate, discrete, denticulate, arising laterally from lower portion of the conidiophores as tiny tooth-like protrusions, with each bearing 1–2 tiny sporogenous conidiogenous loci, hyaline, smooth-walled. Conidia solitary, pleurogenous, helicoid, rounded at tip, multi-septate, tightly coiled 3–4 times, will not becoming loosely in water, guttulate, hyaline, smooth-walled (adapted from Lu et al. 2018).
Type species: Helicoarctatus aquaticus Y.Z. Lu, J.C. Kang & K.D. Hyde
Notes: Helicoarctatus is similar to Helicosporium in having setiform conidiophores and discrete tooth-like protrusions with conidiogenous cells arising laterally from lower portion of the conidiophores with each bearing 1–2 tiny sporogenous conidiogenous loci. Helicoarctatus differs from Helicosporium in having larger conidia. Helicoarctatus is morphologically and phylogenetically a distinct and well-defined genus in Tubeufiaceae. Molecular markers available for Helicoarctatus are ITS, LSU, SSU, TEF-1 and RPB2.
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