Hexagonella F. Stevens & Guba ex F. Stevens, Bulletin of the Bernice P. Bishop Museum, Honolulu, Hawaii 19: 89 (1925).
MycoBank number: MB 2334; Index Fungorum number: IF 2334; Facesoffungi number: FoF 01935; 1 morphological species (Species Fungorum 2020), molecular data unavailable.
Type species – Hexagonella peleae F. Stevens & Guba, in Stevens, Bulletin of the Bernice P. Bishop Museum, Honolulu, Hawaii 19: 89 (1925).
Notes – Hexagonella was introduced as a monotypic genus with H. peleae collected on leaves of Pelea rotundifolia from Hawaii. The genus was characterized by rounded, plane, cushion-like ascomata, with dense, woven mycelium, with the central disk surrounded by irregular periphery of sparsely interwoven, loosely, branched, spreading hyphae, hexagonal, mesh-like peridial structure, 8-spored asci, scattered in hexagonal cell-meshes, resting in a space between the sterile cells and brown, ellipsoidal to oblong, 2-septate ascospores (Stevens 1925, Phookamsak et al. 2016). The type specimens of Hexagonella are located in ILLS and BPI (only micro-slide of ascomata available in BPI). Phookamsak et al. (2016) examined the micro-slide from BPI and noted that the ascomata differed from the original description and iconotype described in Stevens (1925). Phookamsak et al. (2016) tentatively placed the genus in Schizothyriaceae based on the protologue described in Stevens (1925).