Brevicollum Kaz. Tanaka, A. Hashim. & Toy. Sato., Mycologia 109: 610 (2017).
Index Fungorum number: IF 821755; Facesoffungi number: FoF 07374, 2 morphological species (Species Fungorum 2021), 2 species with molecular data.
Saprobic on twig. Sexual morph: Ascomata perithecial, scattered, immersed in bark, erumpent with ostiolar neck, globose to depressed globose, eccentric periphyses neck, compressed at basal to broad apical region. Peridium comprising cells of textura angularis. Hamathecium comprising septate, branched, anastomosing, pesudoparaphyses. Asci bitunicate, clavate, apically broadly rounded, basally narrow, short pedicellate. Ascospores 2- seriate except at the base, fusoid, hyaline to pale grey colored, 1-septate, constricted at the septum, mature spores becoming 3–5 septate with central constricted septa, guttulate, thick sheath, 2 µm wide, surrounded ascospores. Asexual morph: undetermined (Adapted from Tanaka et al. 2017 and Hongsanan et al. 2020a).
Type species: Brevicollum hyalosporum Kaz. Tanaka & Toy. Sato
Notes: Brevicollum was introduced by Tanaka et al. (2017) with B. hyalosporum as type species. Brevicollum is characterized by globose to depressed globose ascomata, clavate, with a central to eccentric, short cylindrical ostiolar neck, apically broadly rounded asci and hyaline to pale grey colored, 1-septate ascospores. Brevicollum resembles Crassiparies in ascospores characters but differs in that the former has 8-spored asci, while Crassiparies has 4-spored asci. Brevicollum has also been compared with Massarina, the type genus of Massarinaceae which has 5-septate, hyaline ascospores with a slightly extended sheath (Hyde and Aptroot 1997; Aptroot 1998). Brevicollum can be distinguished from similar genera based on DNA sequence data. Brevicollum is currently a distinct and well-supported genus in Brevicollum.