Mycosphaerellales » Mycosphaerellaceae


Pseudozasmidium Videira & Crous, in Videira et al., Stud. Mycol. 87: 378 (2017).

Index Fungorum number: IF 822701; Facesoffungi number: FoF 08555, 4 morphological species (Species Fungorum 2022), 3 species with molecular data.

Associated with leaf spots. Sexual morph: Pseudothecia amphigenous, aggregated, black, immersed and becoming erumpent, wall of 2–3 layers of medium brown textura angularis. Asci aparaphysate, fasciculate, bitunicate, subsessile, narrowly ellipsoid or obclavate to cylindrical, straight or slightly incurved, 8-spored. Ascospores bi- to triseriate, overlapping, hyaline, straight to slightly curved, ellipsoid or fusoid-ellipsoid, with obtuse ends, medianly uniseptate, not constricted to slightly constricted at the septum, symmetrical cells or widest at the middle of the apical cell, tapering towards both ends or more prominently towards lower end. Ascospore germination parallel to perpendicular to the long axis of the spore. Asexual morph: Mycelium internal and external, internal hyphae branched, septate, smooth and hyaline, external hyphae verruculose and pale to medium brown, terminal hyphal ends may develop clusters of globose, multi-celled chlamydospore-like structures. Conidiophores pale to medium brown, smooth to verruculose, erect, subcylindrical, straight or curved, branched or unbranched, repeatedly geniculate, septate, sometimes reduced to conidiogenous cells. Conidiogenous cells terminal, smooth to verruculose, pale brown to brown, proliferating sympodially, sometimes repeatedly geniculate, with conidiogenous loci thickened and darkened-refractive. Conidia single, pale brown to olivaceous brown, smooth to verruculose, obclavate, narrowly obclavate to subcylindrical, obtuse apex and obconically truncate base, straight or curved, 1- to multiseptate, hila thickened and darkened-refractive (adapted from Videira et al. 2017).


Type species: Pseudozasmidium parkii (Crous & Alfenas) Videira & Crous


Notes: Pseudozasmidium parkii was previously known as Stenella parkii. The sexual morph of P. parkii is Mycosphaerella parkii Crous, M.J. Wingf., F.A. Ferreira & Alfenas. Pseudozasmidium is characterised by amphigenous, aggregated, black pseudothecia, aparaphysate, fasciculate asci, ellipsoid or fusoid-ellipsoid ascospores, pale to medium brown conidiophores, terminal, smooth to verruculose, pale brown to brown conidiogenous cells and obclavate, narrowly obclavate to subcylindrical conidia. Pseudozasmidium parkii produces a Mycosphaerella-like sexual morph and a zasmidium-like asexual morph. Pseudozasmidium is phylogenetically distinct from Zasmidium. Pseudozasmidium is currently treated as a distinct genus in Mycosphaerellaceae. Molecular markers available for Pseudozasmidium are ITS, LSU, Actin, BTUB, Calmodulin, RPB2 and TEF-1.


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