Cercosphaerella Kleb., Haupt- und Nebenfruchtformen der Ascomyzeten (Leipzig) 1: 132 (1918).
Index Fungorum number: IF 907; Facesoffungi number: FoF 08590, 1 morphological species (Species Fungorum 2022), no molecular data available.
“Cercosphaerella. Konidienform Cercospora. Arten: C. millegrana; cerasella” [Cercosphaerella. Conidial form Cercospora. Species: C. millegrana; cerasella] (adapted from Klebahn 1918 and Videira et al. 2017).
Epiphyllous. Sexual morph: Perithecia scattered, numerous and minute. Asci short, cylindrical. Ascospores crowded, linear and uniseptate, the upper cell being ventricose. Asexual morph: Unknown (adapted from description of Sphaerella millegrana in Cooke 1871).
Type species: Cercosphaerella millegrana (Cooke) Kleb
Notes: Cercosphaerella is characterised by scattered, numerous and minute perithecia, short, cylindrical asci and crowded, linear and uniseptate ascospores. Klebahn (1918) misused the name Sphaerella millegrana, based on a Mycosphaerella on leaf litter of Carpinus betulus. Klebahn (1918) added two species in Cercosphaerella namely C. millegrana and C. cerasella (≡ Mycosphaerella cerasella). Klebahn (1918) reported that Septosphaerella, Ramularisphaerella and Cercosphaerella are three distinct genera. Clements and Shear (1931) mentioned Cercosphaerella as a subgenus of Mycosphaerella and M. millegrana as the lectotype. Sydow (1940) did not agree and described the sexual morph of Passalora microsora as Mycosphaerella microsora. The generic placement of Cercosphaerella based on the lectotype species C. millegrana is uncertain. The placement of Cercosphaerella in Mycosphaerellaceae is doubtful and needs epitypification.
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