Pleurotrema Müll. Arg., Bot. Jb. 6: 388 (1885).
MycoBank number: MB 4251; Index Fungorum number: IF 4251; Facesoffungi number: FoF 07671; 14 morphological species (Species Fungorum 2020), molecular data unavailable.
Type species: Pleurotrema polysemum (Nyl.) Müll. Arg.
≡ Parathelium polysemum Nyl., Bot. Ztg. 20: 279 (1872).
Notes: Pleurotrema was introduced as lichenized by Müller (1885). The placement of this genus has been the subject of controversy as it has been placed in different families viz., Pyrenulaceae, Pleurotremataceae and Ascomycota genera incertae sedis, based on its morphological characters (Barr 1994; Kirk et al. 2001; Lumbsch and Huhndorf 2010). Maharachchikumbura et al. (2016) re-examined the isotype of Pleurotrema polysemum, and synonymized Dyfrolomycetaceae under Pleurotremataceae.