Colpoma Wallr., Fl. crypt. Germ. (Norimbergae) 2: 422 (1833)
= Conostroma Moesz, Bot. Közl. 19: 44 (1921)
Leotiomycetes, Leotiomycetidae, Rhytismatales, Rhytismataceae
Saprobic or parasite on the host plant in terrestrial habitat (Johnston 1991). Sexual morph: see Twyman (1947) and Hou et al. (2005). Asexual morph: Conidiomata dark brown, stromatic, acervular, solitary, subepidermal in origin, immersed, unilocular or multilocular, glabrous. Ostiole absent, dehiscing by the central column rupturing the bark, then opening widely. Conidiomatal wall composed of thick-walled, dark brown to subhyaline cells of textura angularis. Conidiophores arising from innermost layer of locular walls, hyaline, cylindrical to subcylindrical, branched, smooth-walled. Conidiogenous cells hyaline, holoblastic, sympodial, subcylindrical, integrated, indeterminate, smooth-walled, with up to 3 conidia formed sympodially in a very restricted area at the apices. Conidia hyaline, cylindrical, obtuse at the apex, acute or obtuse at the base, unicellular, smooth-walled, eguttulae (Sutton 1980).
Type species: Colpoma quercinum (Pers.) Wallr., Fl. crypt. Germ. (Norimbergae) 2: 423 (1833)
= Conostroma didymum (Fautrey & Roum.) Moesz, Bot. Közl. 19: 44 (1920)
Notes: Conostroma didymum (Fautrey & Roum.) Moesz, type of Conostroma, has been reported as the asexual morph of Colpoma quercinum, type of Colpoma (Sutton 1980). According to one fungus = one name initiative, Conostroma (1920) was reduced to a synonym of Colpoma (1833) (Wijayawardene et al. 2017a). More than 30 epithets are listed in Index Fungorum (2019), but many of them have not been studied by molecular data. Colpoma was accepted as a member of Rhytismataceae (Leotiomycetes) (Lantz et al. 2011, Ekanayaka et al. 2019), but this genus needs to be redefined based on many fresh collections.
Distribution: Austria, China, France, Germany, Roumania, UK, USA, Czech Republic, New Zealand (Sutton 1980, Johnston 1991, Hou and Piepenbring 2005).
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.