Pseudohelminthosporium
Pseudohelminthosporium Phukhams. & K.D. Hyde, in Phukhamsakda et al., Fungal Diversity: 10.1007/s13225-020-00448-4, [59] (2020).
Index Fungorum number: IF 557191; Facesoffungi number: FoF 07283, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Saprobic on decaying wood or herbaceous plant material in terrestrial habitats. Sexual morph: Unknown. Asexual morph: Colonies on host substrates, effuse, black, hairy, scattered, dark brown. Mycelium immersed from the substrate forming dark brown stroma-like aggregations. Conidiophores macronematous, simple, solitary, branched at the apex, stripes straight or flexuous, cylindrical, dark brown to reddish brown, multi-septate, with well-defined small pores at the apex, smooth or verruculose. Conidiogenous cells monotretic or polytretic, integrated, terminal on conidiophores, doliiform to oblong, pale brown. Conidia phragmosporous, acrogenous, broad fusiform or obclavate, dark brown to reddish brown, distoseptate when young, becoming euseptate at maturity, verrucose, dark brown bud scars disjunctions present at the basal position, hyaline, elongate cells at the upper end of conidia, with guttules in each cell (adapted from Phukhamsakda et al. 2020).
Type species: Pseudohelminthosporium clematidis Phukhams. & K.D. Hyde
Notes: Pseudohelminthosporium resembles Helminthosporium in having brown to dark brown phragmosporous conidia. Pseudohelminthosporium is distinct by its solitary stipes with monotretic or polytretic conidiogenous cells, phragmosporous, broad fusiform or obclavate conidia, that are distoseptate when immature, becoming euseptate at maturity, with hyaline, elongate cells at the upper end of the conidia and with a large guttule in each cell. Pseudohelminthosporium is a distinct and well-supported genus in Neomassarinaceae. Molecular markers available for Pseudohelminthosporium are ITS, LSU, SSU, RPB2 and TEF-1.
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