Karschia Körb., Parerga lichenol. (Breslau) 5: 459 (1865).
Index Fungorum number: IF 2545; Facesoffungi number: FoF 07619; 24 morphological species (Species Fungorum 2020), 2 species with molecular data.
Type species: Karschia talcophila (Ach.) Körb., Parerga lichenol. (Breslau) 5: 460 (1865).
≡ Lecidea talcophila Ach., Lich. univ.: 183 (1810).
Notes: More than 100 species of Karschia are listed in Index Fungorum (2020), however, most taxa have been transferred to other genera, such as Buelliella, Cycloschizon, Dothidea and others by Hafellner (1979). Two species were accepted by Hawksworth et al. (1995), and later four species were included (Kirk et al. 2008). Karschia is characterized by a lichenicolous life-style, immersed to erumpent, rounded, black ascomata with a large, irregular opening, producing pseudoparaphyses with a slightly enlarged and brown apex, bitunicate, clavate to subcylindrical asci, ellipsoid, brown, smooth ascospores with one septum (Ertz and Diederich 2015).