Xenoroussoella Mapook & K.D. Hyde, Fungal Divers 101: 93 (2020).
MycoBank number: MB 557367; Index Fungorum number: IF 557367; Facesoffungi number: FoF 07822; 1 morphological species (Mapook et al. 2020), with molecular data.
Type species – Xenoroussoella triseptata Mapook & K.D. Hyde, Fungal Divers 101: 94 (2020).
Notes – Xenoroussoella was introduced by Mapook et al. (2020) to accommodate a saprobic species which was collected from Chromolaena odorata in Thailand. The genus is characterized by immersed, solitary, globose to subglobose ascomata, with protruding ostiolar neck, cylindric- clavate to clavate asci, and brown to dark brown, ellipsoid to obovoid, 3-septate ascospores (Mapook et al. 2020). The asexual morph of Xenoroussoella is unkown. The species can be distinguished from other genera of Roussoellaceae in having ellipsoid to obovoid, 3-septate ascospores (Mapook et al. 2020). Multi-gene phylogenetic analyses showed that the genus is closely related to Arthopyrenia sp. strain UTHSC: DI16-334 in Roussoellaceae (Mapook et al. 2020).