Cyclodothis Syd. & P. Syd., in Sydow & Sydow, Annls mycol. 11(3): 266 (1913).
Index Fungorum number: IF 1371; Facesoffungi number: FoF 08597, 2 morphological species (Species Fungorum 2022), no molecular data available.
Associated with leaf spot. Sexual morph: Stromata erumpent through the epidermis, characteristically annular, with numerous densely arranged small perithecioid loculi, wall distinct, dark brown, composed of small cells, ostiolate. Pseudoparaphyses indistinct. Asci 8-spored, clavate. Ascospores 3- to 4-seriate, oblong cylindrical, colorless, straight, slightly inequilateral, ends obtuse, with a single medial septum. Asexual morph: Unknown (adapted from Sydow and Sydow 1913).
Type species: Cyclodothis pulchella Syd. & P. Syd.
Notes: Cyclodothis is characterised by small perithecioid loculi, clavate asci and oblong cylindrical ascospores. Cyclodothis has been treated as a synonym of Mycosphaerella for several years. Aptroot (2006) observed the type specimen and reported that it only contains a coelomycete. The placement of Cyclodothis in Mycosphaerellaceae is doubtful.