Asperisporium
Asperisporium Maubl., Bull. Soc. mycol. Fr. 29(3): 357 (1913).
Index Fungorum number: IF 7249; Facesoffungi number: FoF 08475, 17 morphological species (Species Fungorum 2022), 2 species with molecular data.
Usually foliicolous, leaf spotting hyphomycetes. Sexual morph: Unknown. Asexual morph: Mycelium in vivo internal; hyphae branched, septate, hyaline to pigmented, thin-walled, smooth or almost so. Stromata usually well-developed, substomatal to intraepidermal, often somewhat erumpent, pigmented. Conidiophores macronematous, usually densely fasciculate, forming sporodochial conidiomata, continuous to septate, pigmented, wall thin to slightly thickened, smooth or almost so. Conidiogenous cells integrated, terminal or conidiophores reduced to conidiogenous cells, usually polyblastic, sympodial, but mostly not strongly geniculate, conidiogenous loci conspicuous, thickened and darkened. Conidia solitary, amero- to phragmosporous (non-scolecosporous), mostly ellipsoid-ovoid, obovoid, fusiform to short cylindrical or obclavate, mostly with 0–3 eusepta, sometimes with a single or several oblique or longitudinal septa, pigmented, distinctly verruculose to coarsely verrucose, basal hilum thickened and darkened, conidial secession schizolytic (adapted from Braun et al. 2013).
Type species: Asperisporium caricae (Speg.) Maubl.
Notes: Asperisporium is characterised by well-developed, substomatal to intraepidermal stromata, macronematous, conidiophores, integrated, terminal conidiogenous cells, and solitary, amero- to phragmosporous conidia. Asperisporium morphologically resembles Passalora -like taxa but differs in having verrucose conidia (Crous and Braun 2003). Minnis et al. (2011) confirmed the taxonomic placement of Asperisporium within the Mycosphaerellaceae based on phylogenetic analyses of ITS and LSU sequence data. Many species assigned to Asperisporum must be individually reassessed as only two species have sequence data. Molecular markers available for Asperisporium are ITS, LSU and RPB2.
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