Distocercosporaster Videira, H.D. Shin, C. Nakash. & Crous, in Videira et al., Stud. Mycol. 87: 304 (2017).
Index Fungorum number: IF 822587; Facesoffungi number: FoF 08495, 1 morphological species (Species Fungorum 2021), 1 species with molecular data.
Foliicolous, plant pathogenic. Mycelium internal, substomatal stromata formed of subhyaline to brown swollen hyphal cells. Sexual morph: Unknown. Asexual morph: Conidiophores in small to moderately large fascicles, arising from stromata, through stomata, erect, straight, subcylindrical to geniculate-sinuous, unbranched, pale olivaceous to olivaceous brown, thin-walled, smooth, septate, sometimes reduced to conidiogenous cells. Conidiogenous cells integrated, terminal, with rim-like conidiogenous loci, thickened and darkened. Conidia hyaline to pale olivaceous, thin-walled, smooth to rough, solitary or catenate, in simple or occasionally branched chains, subcylindrical to obclavate-cylindrical, rarely subclavate, apex obtuse, subobtuse to truncate, base short obconically truncate, straight to curved, eu- or distoseptate, hila thickened and darkened (adapted from Videira et al. 2017).
Type species: Distocercosporaster dioscoreae (Ellis & G. Martin) Videira, H.D. Shin, C. Nakash. & Crous
Notes: Distocercosporaster dioscoreae was previously known as Passalora dioscoreae but was not congeneric with Passalora as defined by the type P. bacilligera. Distocercosporaster resembles Distocercospora but differs in forming stromata composed of sub hyaline to brown swollen hyphal cells, rather short conidiophores with rim-like and noticeably thickened conidiogenous loci on terminal conidiogenous cells, and often catenate conidia in culture. Distocercosporaster is a distinct and well-supported genus in Mycosphaerellaceae. Molecular markers available for Distocercosporaster are ITS, LSU and RPB2.
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