Leptothyrina Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1 124: 123 (1915)
Ascomycota, genera incertae sedis
Saprobic or parasitic on the host plant in terrestrial habitat, for example, Rubus sp. (Rosaceae). Sexual morph: undetermined. Asexual morph: Conidiomata black, amphigenous, subepidermal, immersed, circular, unilocular, glabrous. Ostiole absent, dehiscence by irregular splits of the apical wall. Conidiomatal wall composed of thick-walled, dark brown cells of textura angularis in the upper part, becoming pale brown, larger cells in the basal part. Conidiophores arising from the innermost layer of cells of the basal stroma, hyaline, short-cylindrical, branched at the base, septate, smooth-walled. Conidiogenous cells hyaline, polyblastic, sympodial to synchronous, cylindrical to lageniform, integrated or discrete, indeterminate, smooth-walled, with 1–2 small, unthickened conidiogenous loci at the apices. Conidia hyaline, cylindrical to fusiform, tapered and curved towards the base, obtuse at the apex, unicellular, smooth-walled, eguttulate.
Type species: Leptothyrina rubi (Duby) Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1 124: 123 (1915)
Notes: Leptothyrina is characterized by immersed, acervular-like conidiomata, sympodial, flask-shaped conidiogenous cells and short-cylindrical conidia. The asexual morphs of Coccomyces De Not. and Hypoderma De Not. share a similar form of conidiomata, conidiogenous cells and conidia (Johnston 1986, 1990). Due to a lack of molecular data, Leptothyrina is placed in Ascomycota, genera incertae sedis following (Wijayawardene et al. 2017).
Distribution: Switzerland (Sutton 1980).
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.