Australosphaerella Videira & Crous, in Videira et al., Stud. Mycol. 87: 370 (2017).
Index Fungorum number: IF 822579; Facesoffungi number: FoF 08476, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Associated with leaf spot. Sexual morph: Ascomata pseudothecial, black, slightly erumpent, globose. Asci aparaphysate, fasciculate, bitunicate, subsessile, obclavate to ellipsoidal, straight to incurved, 8-spored. Ascospores multiseriate, overlapping, hyaline, straight to rarely curved, fusoid-ellipsoidal with obtuse ends, medianly uniseptate, widest in middle of apical cell, not constricted at septum or only slightly so. Asexual morph: Unknown (adapted from Videira et al. 2017).
Type species: Australosphaerella nootherensis (Carnegie) Videira & Crous
Notes: Australosphaerella is characterised by pseudothecial, black ascomata, fasciculate, bitunicate, subsessile asci, and multiseriate, overlapping, hyaline 1- septate ascospores. Australosphaerella is only known from its Mycosphaerella-like sexual morph but the ascospores have a unique germination pattern with multiple germ tubes emerging at various angles from both ends of the ascospore (Carnegie et al. 2011). Australosphaerella is a distinct and well-supported genus in Mycosphaerellaceae. Molecular markers available for Australosphaerella are ITS, LSU and RPB2.
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