Mycosphaerellales » Mycosphaerellaceae

Distomycovellosiella

Distomycovellosiella U. Braun, C. Nakash., Videira & Crous, in Videira et al., Stud. Mycol. 87: 330 (2017).

Index Fungorum number: IF 822588; Facesoffungi number: FoF 08497, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.

Associated with leaf spot. Caespituli hypophyllous, pale brown or olivaceous, floccose. Mycelium internal composed of hyaline hyphae, external mycelium composed of pale brown to brown hyphae that arise from internal hyphae. Sexual morph: Unknown. Asexual morph: Stromata lacking or small, composed of few brown cells. Conidiophores emerging through stomata in loose to dense coremioid fascicles, or arising solitary from external hyphae, brown, straight to geniculate, simple, sometimes branched. Conidiogenous cells integrated, terminal or intercalary, polyblastic, proliferating sympodially, with conidiogenous loci thickened and darkened, flat or protruding. Conidia catenate in unbranched or branched chains, pale brown to pale olivaceous, smooth to verruculose, ovoid, obovoid, obclavate, clavate, cylindrical, fusiform, straight or slightly curved, aseptate, euseptate or distoseptate, hila thickened, darkened and refractive (adapted from Videira et al. 2017).

 

Type species: Distomycovellosiella brachycarpa (Syd.) U. Braun, C. Nakash., Videira & Crous

 

Notes: Distomycovellosiella is characterised by pale brown to brown hyphae, coremioid fascicles of conidiophores, terminal or intercalary, polyblastic conidiogenous cells and pale brown to pale olivaceous conidia. Distomycovellosiella is morphologically similar to Mycovellosiella but is not congeneric with its type, M. cajani. Distomycovellosiella differs from Mycovellosiella in forming distoseptate conidia with slightly thickened and refractive loci. Distomycovellosiella is a well-supported genus in Mycosphaerellaceae. Molecular data available for Distomycovellosiella are ITS, LSU and RPB2.

 

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