Alloscorias Haituk & Cheew., in Haituk, Suwannarach, Hongsanan, Senwanna & Cheewangkoon, Phytotaxa 507(4): 276 (2021)

Index Fungorum Number: IF 558107; FacesofFungi Number: FoF 11068

Etymology — Name reflects its morphological similarity to the genus Scorias

Holotype — SDBR-CMU355

Epiphytic on the surface of living leaves. Thallus very thin, superficial, pale brown to brown walls. Sexual morph: Ascomata gregarious to scattered, superficial, globose to subglobose, brown to dark brown, with indistinct ostiole. Setae abundant, corniform, brown, septate, constricted at septate, smooth-walled. Peridium composed of two sections, arranged in textura angularis, outer layer of brown to dark brown, thick-walled cells, inner layer of light brown, thin-walled cells. Asci 8-spored, bitunicate, obpyriform, rounded at the apex, sessile. Ascospores overlapping 2–3-seriate, hyaline, smooth-walled, fusoid, narrowly rounded at the ends, 3–4-septate, upper cells wider and shorter than lower cells, constricted at the septate, with a conspicuous mucilaginous sheath. Asexual morph: Mycelium pale brown to brown at the apex, septate, constricted at septa, rough, thick-walled. Coelomycetous. Conidiomata solitary, brown to dark brown, globose to subglobose. Pycnidial walls composed of pseudoparenchymatous cells of textura angularis, outer layer brown to dark brown, thick-walled cells, inner layer with hyaline cells, thin-walled cells. Conidiophores reduced to conidiogenous cells. Conidiogenous cells enteroblastic, phialidic, integrated, terminal, hyaline, smooth-walled. Conidia oblong to ellipsoid, hyaline, aseptate, guttulate, smooth-walled.

Type speciesAlloscorias syngonii Haituk & Cheew

Notes — Abdollahzadeh et al. (2020) divided Capnodiales into Capnodiales sensu lato and Capnodiales sensu stricto. Capnodiales s. lat. was polyphyletic and split into seven distinct clades. Species in the group were saprobes, while Capnodiales s. str. was monophyletic, and the mode of nutrition was epiphytic (sooty mould) (Abdollahzadeh et al. 2020). Capnodiales s. str. comprises three families, viz. Capnodiaceae, Neoantennariellaceae, and Readerielliopsidaceae. In this study, we introduce Alloscorias as a new genus to accommodate Alloscorias syngonii. Phylogenetic analyses based on a combination of LSU, ITS, TEF-1α, and RPB2 sequence data show that Alloscorias forms a separate clade and is closely related to Scorias. Alloscorias is similar to other representatives in the family Readerielliopsidaceae in having pycnidia superficial, globose to pyriform, and conidia hyaline or pale brown.