Didymella Sacc., Michelia 2(no. 6): 57 (1880)
Dothideomycetes, Pleosporomycetidae, Pleosporales, Didymellaceae
Saprobic or parasitic on terrestrial host plants or from air (Chen et al. 2017). Sexual morph: see Chen et al. (2015). Asexual morph: Conidiomata dark brown to black, pycnidial, solitary to gregarious or confluent, immersed to semi-immersed, globose to subglobose, or irregular in shape, unilocular, glabrous, ostiolate or poroid, sometimes with elongated necks. Ostiole single or multi-ostiolate, centrally located. Conidiomatal wall composed of thick-walled, dark brown to hyaline cells of textura angularis. Conidiophores formed in the inner cavity of conidiomata, reduced to conidiogenous cells. Conidiogenous cells hyaline, enteroblastic, phialidic, doliiform to ampulliform, determinate, smooth-walled. Conidia hyaline or occasionally pale brown, variable in shape, i.e. cylindrical to subcylindrical, or ellipsoidal to subglobose, or fusiform, oblong, ovoid, sometimes allantoid, 0–1-septate, smooth-walled, guttulate (Chen et al. 2015, Jayasiri et al. 2017).
Type species: Didymella exigua (Niessl) Sacc., Syll. fung. 1: 553 (1882)
Notes：Chen et al. (2015) delineated Didymella to accommodate the species (Peyronellaea and several phoma-like species), which have close phylogenetic affinity with D. exigua. Fifty-four species are accepted in Didymella (Chen et al. 2015, 2017, Crous et al. 2018a). Members of this genus are cosmopolitan, having been reported in Africa (Egypt, Ethiopia, South Africa), Asia (China, India), Europe (Belgium, France, Germany, Italy, Romania, Russia, Spain, Switzerland, The Netherlands, UK), North America (USA, Canada), Oceania (Australia, New Zealand) and South America (Peru) (Aveskamp et al. 2010, Chen et al. 2015, 2017, Jayasiri et al. 2017, Crous et al. 2018a). We add an additional collection of D. macrostoma on Vicia sp. in Italy, and provide a detailed description and photo plate.
Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.