Hemimyriangium J. Reid & Piroz, Can. J. Bot. 44: 650 (1966).
MycoBank number: MB 2284; Index Fungorum number: IF 2284; Facesoffungi number: 06548; 3 morphological species (De Almeida et al. 2014, Species Fungorum 2020), molecular data unavailable.
Type species – Hemimyriangium betulae J. Reid & Piroz., Can. J. Bot. 44: 651 (1966).
Notes – This monotypic genus was placed in Myriangiaceae by Reid and Pirozynski (1966b). Lumbsch & Huhndorf (2007) placed Hemimyriangium in Elsinoaceae and this was followed in Hyde et al. (2013). However, this taxon appears to be more similar to Myriangium in having superficial ascostromata with a single ascus in each locule and in the arrangement of locules in the outer layer of the ascostromata as well as due to its saprobic nature, but differs by ascospores without longitudinal septa. Therefore, Jayawardena et al. (2014) excluded this genus from Elsinoaceae and Dissanayake et al. (2014) treated it in Myriangiaceae. Fresh collections and molecular analyses are needed to clarify the familial position of this genus.