Dimerium (Sacc. & P. Syd.) McAlpine, Proc. Linn. Soc. N.S.W. 28: 98 (1903).

Dimerosporium subgen. Dimerium Sacc. & P. Syd., Syll. fung. (Abellini) 16: 410 (1902).

MycoBank number: MB 25887; Index Fungorum number: IF 25887; Facesoffungi number: FoF 06391; 73 morphological species (Species Fungorum 2020), molecular data unavailable.

Type species: Dimerium olivaceum Syd. & P. Syd.

Notes: Dimerium is a single genus in Dimeriaceae (Wijayawardene et al. 2018). Many species were transferred to other genera based on shared characters (Boonmee et al. 2017). More collections of the members in this genus and sequence data are needed to clarify their taxonomic placement.