Mycosphaerellales » Mycosphaerellaceae


Parapallidocercospora Videira, Crous, U. Braun & C. Nakash., in Videira et al., Stud. Mycol. 87: 310 (2017).

 Index Fungorum number: IF 822604; Facesoffungi number: FoF 08538, 2 morphological species (Species Fungorum 2022), 2 species with molecular data.

Plant pathogenic. Leaf spots amphigenous, irregular to subcircular. Sexual morph: Ascomata pseudothecial, predominantly hypophyllous, black, subglobose to globose, with apical ostiole, walls of 2–3 layers of medium brown textura angularis. Asci fasciculate, bitunicate, subsessile, cylindrical to narrowly ellipsoidal, straight or slightly incurved. Ascospores bi- to multiseriate, overlapping, hyaline, guttulate, thin-walled, straight to slightly curved, fusoid-ellipsoidal, obovoid, medianly uniseptate, not constricted at septum or only slightly constricted, tapering toward both ends but more prominently toward the base. Asexual morph: Spermogonia intermixed with the ascomata or with the asexual morph, hyaline and rod-shaped. Mycelium internal and external, hyphae light brown, septate, branched, smooth. Conidiophores arising from superficial mycelium, from the upper cells of a brown stroma; conidiophores light brown, smooth, aseptate or septate, subcylindrical, straight to variously curved, unbranched. Conidiogenous cells terminal, unbranched, light brown, smooth, tapering to flat-tipped apical loci, proliferating sympodially, rarely percurrently near apex. Conidia solitary, light brown, smooth to finely verruculose, septate, guttulate, narrowly obclavate or subcylindrical, tapering towards the base, straight to curved (adapted from Videira et al. 2017).

 Type species: Parapallidocercospora colombiensis (Crous & M.J. Wingf.) Videira & Crous

Notes: Parapallidocercospora is characterised by pseudothecial, black, subglobose to globose ascomata, fasciculate, bitunicate, subsessile, cylindrical to narrowly ellipsoidal asci and bi- to multiseriate, overlapping, hyaline, guttulate, medianly uniseptate ascospores. Parapallidocercospora is morphologically similar to species of Pseudocercospora s. str. and are difficult to identify without molecular data. Parapallidocercospora is morphologically and phylogenetically a distinct and well-defined genus in Mycosphaerellaceae. Molecular markers available for Parapallidocercospora include ITS, LSU, SSU, Actin, Btub, Calmodulin, TEF-1 and RPB2.


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