Micronematomyces U. Braun, C. Nakash., Videira & Crous, in Videira et al., Stud. Mycol. 87: 337 (2017).
Index Fungorum number: IF 822595; Facesoffungi number: FoF 08511, 2 morphological species (Species Fungorum 2021), 2 species with molecular data.
Leaf spots amphigenous, resembling those of Pseudocercospora eupatorii-formosani. Sexual morph: Unknown. Asexual morph: Mycelium internal and external, consisting of pale brown, septate, branched, smooth, 3–4 µm wide hyphae. Caespituli fasciculate, amphigenous, brown. Conidiophores arising singly from superficial mycelium, or aggregated in loose fascicles arising from a brown stroma, smooth, medium brown, 1–5-septate, subcylindrical, straight to geniculate-sinuous, unbranched. Conidiogenous cells terminal, polyblastic, unbranched, medium brown, smooth, tapering to rounded apices with flat-tipped apical conidiogenous loci which are darkened, thickened, refractive, proliferating sympodially. Conidia solitary, medium brown, smooth, guttulate, obclavate, apex obtuse, base obconically subtruncate, straight to slightly curved, 3–6-septate, hila darkened, thickened, refractive (adapted from Den Breeyen et al. 2006).
Type species: Micronematomyces caribensis (Crous & Den Breeÿen) U. Braun, C. Nakash., Videira & Crous
Notes: Micronematomyces differs from Passalora s. str. in forming short conidiophores, and multiseptate conidia that are cylindrical, long-obclavate to filiform. Phylogenetically, Micronematomyces is a distinct and well-supported genus in Mycosphaerellaceae. Molecular markers available for Micronematomyces include ITS, LSU and RPB2.
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