Phaeoxyphiella
Phaeoxyphiella Bat. & Cif., Quad. Lab. crittogam., Pavia 31: 145 (1963).
Index Fungorum number: IF 9326; Facesoffungi number: FoF 11072, 7 morphological species (Species Fungorum 2022), 2 species with molecular data.
Sooty mould. Mycelium superficial or immersed, hyaline to medium brown, branched, hyphae smooth to slightly verruculose, thin-walled, septate, constricted at septa, with a mucilaginous outer wall layer. Sexual morph: Unknown. Asexual morph: Pycnidia superficial or immersed, glabrous, sessile, obclavate, pyriform or conoidal, brown, membraneous, thin-walled. Ostiole present, simple, without hyphal extensions. Conidia pale to medium brown, transversely euseptate, not constricted at septa, 11–19-celled, filiform, fusoid-ellipsoidal, straight to somewhat curved, ends rounded, often with a truncate base, smooth. Spermatogonia superficial or immersed, globose to subglobose, pale to dark brown, mostly intercalary, lateral or terminal on erect hyphal branches. Ostiole absent, releasing microconidia by means of irregular rupture. Microconidia hyaline, aseptate, ellipsoid to ovoid, continuous, with minute guttules, smooth, thin-walled (adapted from description of Phaeoxyphiella phylicae in Abdollahzadeh et al. 2020).
Type species: Phaeoxyphiella morototoni Bat. & Cif.
Notes: Phaeoxyphiella is characterised by superficial or immersed, glabrous pycnidia, pale to medium brown, transversely euseptate conidia, superficial or immersed, globose to subglobose spermatogonia, ostiole releasing microconidia via an irregular rupture and hyaline, aseptate, ellipsoid to ovoid microconidia. In a phylogenetic analysis (Abdollahzadeh et al. 2020) based on SSU, ITS, TEF-1α and RPB2, strains of Phaeoxyphiella clustered into two distinct clades. Phaeoxyphiella is morphologically and phylogenetically a distinct genus in Readerielliopsidaceae. Molecular markers available for Phaeoxyphiella include P. australiana (ITS, LSU, RPB2, TEF-1) and P. phylicae (ITS, RPB2, TEF-1).
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