Arxiella Papendorf, Trans. Br. mycol. Soc. 50(1): 73 (1967)
Index Fungorum number: IF 7233; Facesoffungi number: FoF 08091, 3 morphological species (Species Fungorum 2021), 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, simple or branched, hyaline or faintly olivaceous, all cells conidiiferous. Conidia apical or lateral on cells of conidiophore, sessile or on short or elongate sterigma-like projections, single or in short chains or in small irregular groups of interconnected members, reniform with ends obliquely cornute, hyaline to fainly coloured, smooth, medianly 1-septate (Adapted from Papendorf 1967).
Type species: Arxiella terrestris Papendorf
Notes: Arxiella was introduced by Papendorf (1967) with A. terrestris as type species. Arxiella is characterized by both coelomycetous and hyphomycetous morphs. Coelomycetous morph is characterized by sporodochial, brown conidiomata on agar surface, with globose to slightly elongated, phialidic, brown conidiogenous cells, and reniform, medianly 1-septate conidia, with guttulate, horn-like appendages at the ends (Crous et al. 2014). While, the hyphomycetous morph is characterized by septate, branched, hyaline to somewhat olivaceous hyphae, with 1- to multi-celled, conidiiferous conidiophores, and reniform, ends obliquely cornute, 1-septate, hyaline to somewhat colored conidia, on short or elongate sterigma-like projections, single or in short chains or in small irregular groups (Papendorf 1967). Crous et al. (2014) treated Arxiella as incertae sedis while, Crous et al. (2018a) placed Arxiella in Muyocopronaceae. This was followed by Hernández-Restrepo et al. (2019) who supported the placement of Arxiella in Muyocopronaceae based on a phylogenetic tree.