Brevicollum Kaz. Tanaka, A. Hashim. & Toy. Sato., Mycologia 109: 610 (2017).

MycoBank number: MB 821755; Index Fungorum number: IF 821755; Facesoffungi number: FoF 07374; 2 morphological species (Species Fungorum 2020), 2 species with molecular data.

Type speciesBrevicollum hyalosporum Kaz. Tanaka & Toy. Sato, Mycologia 109: 611 (2017).

Notes – The sexual morphs of Brevicollum are characterized by immersed, globose to depressed globose ascomata, with a central to eccentric, short cylindrical ostiolar neck, a thin ascomatal wall, clavate asci with a shallow ocular chamber, and broadly fusiform, 3–5-septate ascospores. The asexual morph of the genus is unknown (Tanaka et al. 2017). Brevicollum is similar to Crassiparies in ascospore characteristics. However, Brevicollum has 8-spored asci, while Crassiparies has 4-spored asci. They are also phylogenetically apart (Hyde et al. 2018).

Brevicollum hyalosporum occurs in various plant species as saprobes and endophytes, and is widely distributed in temperate and tropical regions (Tanaka et al. 2017). Brevicollum hyalosporum was identified as a saprobe on branches of Hevea brasiliensis Müll.Arg (Hyde et al. 2018) which is an economically important crop and also on dead twigs of Syzygium samarangense (Myrtaceae) in Japan and Thailand (Tanaka et al. 2017). This species is similar to Massarina palmicola (Massarinaceae) which also has 5-septate, hyaline ascospores with a slightly expanded sheath (Hyde & Aptroot 1997, Aptroot 1998).