Xenospadicoidaceae Hern.-Restr., J. Mena & Gené, Studies in Mycology 86: 91 (2017)

MycoBank number: MB 820349; Index Fungorum number: IF 820349; Facesoffungi number: FoF 05404; 74 species.

= Lentomitellaceae H. Zhang, K.D. Hyde & Maharachch, Fungal Divers. 85: 95 (2017)

Lignicolous in terrestrial and freshwater environments. Sexual morph: Ascomata perithecial, astromatic, partially superficial, scattered or grouped. Neck cylindrical or rostrate with or without sulcations, subhyaline to dark brown. Ostiole periphysate. Paraphyses septate, tapering. Peridium two layered. Asci 8-spored, unitunicate, cylindrical or cylindrical-clavate, pedicellate, with a J-, apical ring. Ascospores overlapping uniseriate, hyaline or pale brown, aseptate or septate, ellipsoidal to fusiform, ovoid, suboblong, smooth-walled or ornamented. Asexual morph: Hyphomycetous. Colonies effuse. Conidiophores macronematous, mononematous, branched or unbranched, septate, brown near base, subhyaline to hyaline towards the apex. Conidiogenous cells tretic or blastic, terminal or intercalary, hyaline or brown, subcylindrical, sympodially proliferating. Conidia globose, ellipsoidal, obovoid to clavate, hyaline or brown, aseptate or septate, smooth- walled. Synasexual morph: selenosporella-like asexual morphs are sometimes formed in vitro and in vivo. Conidiophores macronematous or semi-macronematous, mononematous, branched or unbranched, often reduced to conidiogenous cells. Conidiogenous cells blastic, discrete, terminal or intercalary, subcylindrical to flask-shaped, with a short terminal, rachis bearing a few denticles. Conidia globose, clavate to obovate, or narrow fusiform, hyaline, aseptate, smooth-walled (adapted from Hernández-Restrepo et al. 2017).

Type genusSpadicoides S. Hughes

Notes – Xenospadicoidaceae was introduced by Hernández-Restrepo et al. (2017) as a monotypic family in Xenospadicoidales, which was established at the same time. Xenospadicoidaceae included two monotypic genera, the type genus Xenospadicoides and Pseudodiplococcium (Hernández-Restrepo et al. 2017). Hernández-Restrepo et al. (2017) synonymized six species under Xenospadicoides, including Spadicoides atra, the type species. Réblová et al. (2018) emended Xenospadicoidaceae based on combined act1, ITS, LSU, SSU, tub2 and rpb2 sequence data. Pseudodiplococcium and Xenospadicoides was reduced to synonymy under Spadicoides, which was assigned as the type genus (Réblová et al. 2018). Three more genera, Calyptosphaeria, Lentomitella and Torrentispora, were added to Xenospadicoidaceae. In addition, Lentomitellaceae was synonymized under Xenospadicoidaceae (Réblová et al. 2018). Subsequently, the fifth genus, Neospadicoides in Xenospadicoidaceae was introduced by Luo et al. (2019) from freshwater habitats.