Teratosphaeria Syd. & P. Syd., Annls mycol. 10(1): 39 (1912).
MycoBank number: MB 5377; Index Fungorum number: IF 5377; Facesoffungi number: FoF 01713; 36 morphological species (Species Fungorum 2019), several species with molecular data.
Type species – Teratosphaeria fibrillosa Syd. & P. Syd.
Notes – In morphology, Teratosphaeria resembles Mycosphaerella (current name Ramularia), but Müller & Oehrens (1982) separated them based on their ascomatal arrangement and periphysate ostioles. Kirk et al. (2001) placed Teratosphaeria in Pleosporaceae. Pleosporaceae and Teratosphaeria have been regarded as members in Clypeosphaeriaceae, Montagnellaceae, Stigmateaceae (Syn. Venturiaceae) and Phaeosphaeriaceae (Müller & Oehrens 1982, Taylor et al. 2003). Taylor et al. (2003) showed that the type species of Teratosphaeria resided in Mycosphaerella sensu stricto, thus regarded the former as a synonym of the latter. However, Crous et al. (2007a) showed that Teratosphaeria has a distinct phylogenetic lineage in Capnodiales which also clearly separated it from Mycosphaerellaceae. Crous et al. (2007a) compared the morphological characters between the type species and the other species which group in Teratosphaeria sensu stricto. The epitype of Teratosphaeria fibrillosa was designated by Crous et al. (2007a). Crous et al. (2009d, e) showed that Teratosphaeria has Kirramyces and Colletogloeopsis as its asexual morphs. Thus, Kirramyces and Colletogloeopsis have been regarded as synonym of Teratosphaeria (Crous et al. 2009d, e; Art. 59.1).