Mycosphaerellopsis Höhn., Annal. Mycol. 16(1/2): 157 (1918).
Index Fungorum number: IF 3345; Facesoffungi number: FoF 06263; 2 morphological species (Species Fungorum 2020), molecular data unavailable.
Biotrophic or saprotrophic on leaves. Sexual morph: Ascostromata, uniloculate, solitary, gregarious, immersed to semi-immersed, globose to subglobose, brown to dark brown. Cells of ascostromata composed of brown-walled cells arranged in a textura globulosa. Ostioles periphysate. Hamathecium lacking pseudoparaphyses at maturity. Asci 8-spored, bitunicate, fissitunicate, oblong to saccate, with a long pedicel, and an ocular chamber. Ascospores 1-3 seriate and partially overlapping, ellipsoid to broadly obovoid, broadly rounded at the apex, narrowly rounded at the base, hyaline, 1-septate, constricted at the central septum, with one guttule in each cell, slightly roughened. Asexual morph: Conidiomata pycnidial. Conidiogenous cells short, holoblastic. Conidia oblong, uniseptate, hyaline (asexual morph description follows Barr, 1996).
Type species: Mycosphaerellopsis myricariae (Fuckel) Höhn.
Notes: Mycosphaerellopsis has uniloculate ascomata which are different to other genera in Planistromellaceae. Mycosphaerellopsis was tentatively included in this family due to lack of molecular data (Monkai et al. 2013). The sequencing of fresh material is required to confirm the placement of this genus.
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