Phaeothecoidiellaceae K.D. Hyde & Hongsanan, in Hongsanan et al., Mycosphere 8(1): 137–146 (2017).

= Nowamycetaceae Crous, in Crous, Wingfield, Cheewangkoon, Carnegie, Burgess, Summerell, Edwards, Taylor, Groenewald, Stud. Mycol. 94: 209 (2019).

MycoBank number: MB 552766; Index Fungorum number: IF 552766; Facesoffungi number: FoF 02883, 25 species.

Epiphytes or pathogens on fruits, leaves, and stems. Thallus very thin, covering surface of host with dark brown hyphae, sometimes absent. Superficial hyphae septate, not constricted at the septum, branched, brown to dark brown. Sexual morph: Thyriothecia superficial on host surface, circular, flattened, poorly developed at the base, thin-walled, brown to dark brown, with or without central ostiole. Thyriothecial setae arising from the surface of thyriothecia, brown to dark brown, smooth-walled, thyriothecial setae absent in some species. Upper wall comprises interwoven, dark brown cells. Peridium comprises two layers with flattened cells of textura angularis, inner layer hyaline, outer layer dark brown or reddish brown. Hamathecium comprising cellular pseudoparaphyses. Asci 8-spored, bitunicate, subcylindrical to obovoid, or globose to subglobose, pedicellate or apedicellate, with or without ocular chamber. Ascospores 2–3-seriate or irregularly overlapping, ellipsoid, hyaline, 1-septate, with or without appendages. Asexual morph: Hyphomycetous. Colonies effuse to punctiform. Mycelium septate, branched, brown to dark brown, sometimes covered in a mucilaginous sheath. Endoconidia phragmospores inside hyphae, pale brown to brown, aseptate, subcylindrical to broadly ellipsoid, thin-walled, roughened upon release, sometimes with a thin inconspicuous septum. Conidiophores intercalary, dark-brown, subcylindrical to cuneiform, reduced to conidiogenous cells, with conidiogenesis holoblastic to phialidic. Conidia broadly ellipsoid to subcylindrical or obclavate, truncate at base, rounded at apex, brown, transversely septate, tapering to a cuneiform with a truncate hilum at base (adapted from Yang et al. 2010, Hongsanan et al. 2017).

TypePhaeothecoidiella Batzer & Crous.

NotesPhaeothecoidiellaceae is a family causing sooty blotch and flyspeck diseases. It was established within Capnodiales to accommodate Chaetothyrina, Houjia and Phaeothecoidiella by Hongsanan et al. (2017). Phylogenetically, these genera formed a distinct clade sister to the Dissoconiaceae, Mycosphaerellaceae and  Schizothyriaceae clades in Capnodiales  (Yang et al. 2010, this study). Zeng et al. (2018b) introduced a new genus Translucidithyrium to this family based on morphology and phylogeny. Nowamycetaceae was introduced by Crous et al. (2019d) to accommodate two species of Nowamyces (N. globulus and N. piperitae). Phylogenetic analyses supported this family in Capnodiales. By including all genera of Phaeothecoidiellaceae that have sequence data in our phylogenetic analysis, we found that Nowamycetaceae species clustered within Phaeothecoidiellaceae. Thus, we synonymise Nowamycetaceae in Phaeothecoidiellaceae.