Xenoteratosphaeria Quaedvl. & Crous, in Quaedvlieg et al., Persoonia 33: 34 (2014).
Index Fungorum number: IF 807847; Facesoffungi number: FoF 07045, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Foliicolous, plant pathogenic. Sexual morph: Ascomata immersed, substomatal, black, singular, gregarious, immersed, becoming erumpent through the stomatal pore, pyriform or globose with a papillate periphysate ostiole. Asci obclavate, straight, subsessile or with a small pedicel, narrowing slightly to a rounded apex with a distinctive ocular chamber, 8-spored, bitunicate with fissitunicate dehiscence. Ascospores bi- to multiseriate, fusiform, tapering gradually to the rounded ends, widest in the middle of the upper cell, with the lower cell slightly narrower and longer, straight, hyaline, becoming pale brown with age, medianly septate. Asexual morph: Unknown (adapted from Quaedvlieg and Crous 2014).
Type species: Xenoteratosphaeria jonkershoekensis (P.S. van Wyk, Marasas & Knox-Dav.) Quaedvl. & Crous
Notes: Xenoteratosphaeria is characterised by substomatal, black, singular or gregarious ascomata, obclavate, straight, subsessile asci, and fusiform, hyaline, becoming pale brown on maturity, medianly septate ascospores. Xenoteratosphaeria morphologically resembles Teratosphaeria in having brown ascospores but is distinct in that the former has culture hyphae that are brown and form multicellular chlamydospore-like structures which is absent in Teratosphaeria s.str (Crous et al. 2000). Xenoteratosphaeria is morphologically and phylogenetically a distinct genus in Teratosphaeriaceae. Molecular markers available for Xenoteratosphaeria are ITS, LSU and RPB2.
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