Xenosonderhenia Crous, in Crous et al., Persoonia 28: 175 (2012).
Index Fungorum number: IF 800389; Facesoffungi number: FoF 06970, 3 morphological species (Species Fungorum 2022), 3 species with molecular data.
Foliicolous, associated with leaf spots. Sexual morph: Unknown. Asexual morph: Conidiomata pycnidial, black, globose, sub stomatal, erumpent, predominantly epiphyllous, with central ostiole, lined with periphyses; wall of 2–3 layers of brown textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells lining the inner cavity, subcylindrical to doliiform; finely verruculose, pale brown, proliferating apically with several percurrent proliferations. Conidia subcylindrical, brown, finely verruculose, apex obtuse, base truncate with visible scar, (1–)3-euseptate, but septa with visible central pore. Conidia of synasexual morph intermingled in same conidioma, but conidiogenous cells proliferating per currently or sympodially; conidia hyaline to sub hyaline, narrowly obclavate, apex subobtuse, base truncate, straight to curved, transversely multi-septate. Synasexual morph: hyphomycetous, developing in aerial mycelium; conidiophores subcylindrical, straight to curved, 0–2-septate, hyaline to sub hyaline, proliferating sympodially at apex. Conidiophores solitary or fasciculate or forming on a reduced stroma.
Type species: Xenosonderhenia syzygii Crous
Notes: Xenosonderhenia resembles Readeriella and Phaeophleospora in having brown proliferating conidiogenous cells but is unique in having hyaline to subhyaline, narrowly obclavate conidia of a synasexual morph, in culture occurring separately or in same conidiomata. Xenosonderhenia is morphologically and phylogenetically a distinct genus in Mycosphaerellaceae. Molecular markers available for Xenosonderhenia includes ITS, LSU and RPB2.
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