Microcyclosporella J. Frank, Schroers & Crous, in Frank et al., Persoonia 24: 101 (2010).
Index Fungorum number: IF 516840; Facesoffungi number: FoF 08510, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Hyphomycetous. Sexual morph: Unknown. Asexual morph: Mycelium consisting of pale brown, smooth to finely verruculose, branched, septate, 2–3.5 µm wide hyphae, at times covered in a mucoid layer, with integrated, lateral, truncate conidiogenous loci. Conidiophores mostly reduced to conidiogenous cells. Conidiogenous cells integrated, intercalary on hyphae, rarely terminal, cylindrical to doliiform, pale brown, but hyaline if occurring in yeast-like sectors of colonies, smooth, mono- or polyblastic, proliferating sympodially; loci inconspicuous, truncate, unthickened, not darkened, pale brown to hyaline. Conidia hyaline, smooth, subcylindrical to narrowly obclavate or narrowly fusoid with acutely rounded apex and obconically truncate base, guttulate, 0–6 transversely septate; microcyclic conidiation common (adapted from Frank et al. 2010).
Type species: Microcyclosporella mali J. Frank, Schroers & Crous
Notes: Microcyclosporella is characterised by pale brown, smooth to finely verruculose mycelium, conidiogenous cells integrated and intercalary on hyphae, and hyaline, smooth, subcylindrical conidia. Microcyclosporella resembles Pseudocercosporella in having hyaline conidiophores, and transversely septate, hyaline scolecosporous conidia with inconspicuous hila (Batzer et al. 2005) but can be differentiated based on DNA sequence data. Microcyclosporella is a distinct and well-supported genus in Mycosphaerellaceae. Molecular markers available for Microcyclosporella are ITS, LSU, SSU, Actin, RPB2 and TEF-1.