Cleistosphaera Syd. & P. Syd., Annls mycol. 14(1/2): 74 (1916).
MycoBank number: MB 1100; Index Fungorum number: IF 1100; Facesoffungi number: FoF 07869; 1 morphological species (Species Fungorum 2020), molecular data unavailable.
Type species: Cleistosphaera macrostegia Syd. & P. Syd.
Notes: Cleistosphaera is similar to taxa in Botryosphaeriaceae based on its asci and ascospore features, however, it differs from Botryosphaeriaceae by mycelium with hyphopodia. The asexual morph of C. macrostegia are phoma-like (coelomycetous) which differentiates it from all genera in Perisporiopsidaceae (hyphomycetous).