Xenopyrenochaetopsis
Xenopyrenochaetopsis Valenz. -Lopez, Crous, Stchigel, Guarro & Cano, in Valenzuela-Lopez et al., Stud. Mycol. 90: 62 (2017).
Index Fungorum number: IF 820311; Facesoffungi number: FoF 08359, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Pathogenic on host. Sexual morph: Unknown. Asexual morph: Conidiomata pycnidial, pale brown to brown, solitary or confluent, pycnidial wall of textura angularis, glabrous, globose, ostiolate. Conidiogenous cells phialidic, hyaline. Conidia aseptate, hyaline, smooth- and thin-walled, cylindrical, guttulate (adapted from Valenz-Lopez et al. 2017).
Type species: Xenopyrenochaetopsis pratorum (P.R. Johnst. & Boerema) Valenz. -Lopez, Crous, Stchigel, Guarro & J.F. Cano
Notes: Xenopyrenochaetopsis is characterised by pycnidial, pale brown to brown conidiomata, phialidic, hyaline conidiogenous cells and aseptate, hyaline, smooth- and thin-walled conidia. Xenopyrenochaetopsis is phylogenetically distinct from the genus Pyrenochaetopsis. de Gruyter et al. (2013) proposed the new combination Pyrenochaetopsis pratorum for Phoma pratorum. In the study of de Gruyter et al. (2013), P. pratorum clustered with Pyrenochaetopsis but phylogenetically apart from P. leptospora, the type species of Pyrenochaetopsis. In the phylogenetic analyses of Valenz-Lopez et al. (2017), P. pratorum clustered outside Pyrenochaetopsis s.str hence, the new combination X. pratorum was proposed. A multigene analysis comprising LSU, SSU, RPB2, BTUB sequence data is ideal to introduce new species of Xenopyrenochaetopsis. Xenopyrenochaetopsis is morphologically and phylogenetically a distinct genus in Pyrenochaetopsidaceae. Molecular markers available for Xenopyrenochaetopsis are ITS, LSU, SSU, BTUB and RPB2.
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