Rhytidhysteron Speg. [as ‘Rhytidhysterion’], Anal. Soc. cient. argent. 12(4): 188 (1881).

MycoBank number: MB 4740; Index Fungorum number: IF 4740; Facesoffungi number: FoF 08063; 21 morphological species (Species Fungorum 2020), 8 species with molecular data.

Type speciesRhytidhysteron brasiliense Speg., Anal. Soc. cient. argent. 12(4): 188 (1881).

Notes – The genus was introduced to accommodate R. brasiliense and R. viride and is typified by R. brasiliense (Spegazzini 1881, Silva-Hanlin & Hanlin 1999). Rhytidhysteron is characterized by closed and navicular ascomata, later opening by a longitudinal slit to become irregularly apothecioid at maturity and heavily pigmented, and with thick-walled ascospores (Boehm et al. 2009b). The genus includes saprobic to weakly pathogenic taxa that grow on woody plants in terrestrial habitats (Yacharoen et al. 2015, Hyde et al. 2020b). Most taxa are involved in wood degradation.