Dothidea Fr., Observ. mycol. (Havniae) 2: 347 (1818).
Synonyms: Phragmodothis Theiss. & Syd., Annls mycol. 12(2): 179 (1914)
Systremma Theiss. & Syd., Annls mycol. 13(3/4): 330 (1915)
MycoBank number: MB 1693; Index Fungorum number: IF 1693; Facesoffungi number: FoF 00066, 33 morphological species (Species Fungorum 2020), 8 species with molecular data.
Type species – Dothidea sambuci (Pers.) Fr.
Saprobic on dead wood, stems and twigs. Sexual state: Ascostromata dark brown to black, erumpent through the outer layer of the host tissue, to superficial, solitary or scattered, pulvinate, globose to subglobose, coriaceous, multiloculate, with 3–15 locules, cells of ascostromata composed of several layers of dark brown cells of textura angularis. Locules globose to subglobose, broadly or narrowly conical, thick-walled, with or without ostioles. Peridium of locules comprising 1–2 layers of thick-walled, lightly pigmented, dark brown to black cells of textura angularis. Hamathecium lacking pseudoparaphyses. Asci eight-spored, bitunicate, fissitunicate, clavate to sub-cylindrical, with a short broad pedicel, thickened and rounded at apex, with a clear ocular chamber. Ascospores uniseriate to biseriate, partially overlapping, hyaline, sometimes brown, 1-septate, constricted at the septum, ellipsoidal or oblong to obovoid with broadly rounded ends, smooth-walled, thick-walled, with or without a sheath. Asexual state: See notes
Notes – Dothidea is mainly characterized in having dark brown to black, erumpent to superficial, solitary or scattered, multiloculate ascostromata, with 3–15 locules, with or without ostioles, 8-spored, bitunicate, fissitunicate asci with a short broad pedicel, and 1-septate ascospores with or without a sheath. The asexual morph of Dothidea is undetermined. Members of this genus live in both terrestrial and aquatic habitats and are found worldwide (Lumbsch & Huhndorf 2010, Wijayawardene et al. 2017a).
Species