Arxiella
Arxiella Papendorf, Trans. Br. mycol. Soc. 50(1): 73 (1967).
Index Fungorum number: IF 7233; Facesoffungi number: FoF 08091, 3 morphological species (Species Fungorum 2022), 3 species with molecular data.
Saprobic on leaf-litter. Sexual morph: Unknown. Asexual morph: Hyphae septate, branched, thick-walled, hyaline to faintly olivaceous. Conidiophores one to many-celled, continuous with hypha or basally septate, macronematous, simple or branched, hyaline or faintly olivaceous, with all cells phialidic and conidiiferous. Conidiogenous cells apical or lateral on conidiophore, phialidic, sessile or on short or elongate sterigma-like projections. Conidia single or in short chains or in small irregular interconnected groups, reniform with obliquely cornute ends, hyaline to faintly colored, smooth, median uniseptate (adapted from Papendorf 1967).
Type species: Arxiella terrestris Papendorf
Notes: Arxiella was treated as incertae sedis by Crous et al. (2014) and later transferred to Muyocopronaceae by Crous et al. (2018). This was followed by other authors (Hernández-Restrepo et al. 2019; Hongsanan et al. 2020b). According to Crous et al. (2014), Arxiella also has coelomycetous morph characterised by brown conidiomata on agar media, with globose to slightly elongated, phialidic, brown conidiogenous cells, and reniform, medianlyuniseptate conidia, with guttulate and horn-like appendages at the ends. Molecular markers available for Arxiella are ITS, LSU, SSU, RPB2 and TEF-1.
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