Acrospermum Tode, Fung. mecklenb. sel. (Lüneburg) 1: 8 (1790).

MycoBank number: MB 54; Index Fungorum number: IF 54; Facesoffungi number: FoF 06381; 28 morphological species (Species Fungorum 2020), 8 species with molecular data.

Type species: Acrospermum compressum Tode, Fung. mecklenb. sel. (Lüneburg) 1: 8 (1790).

Notes: Tode (1790) introduced Acrospermum with A. compressum as the type species based on fruiting body and ostiole type. Acrospermum is characterised by superficial, club-like ascomata, bitunicate asci and fasciculate, filiform, hyaline, multi-septate ascospores (Riddle 1920). Species of Acrospermum are mostly saprobic and are distributed worldwide. The specimens of A. compressum were found on dry stems of Heracleum sphondylium in Germany. Acrospermum compressum can also be observed on dead stems of Urtica dioica, and A. graminum on grass culms. Acrospermum adeanum is a necrotrophic parasite and has been observed on 32 different moss species from 22 different genera, most of which belong to the pleurocarpous superorder Hypnanae (Döbbeler 1979; Bell and Newton 2004). The asexual morph of Acrospermum is hyphomycetous (Wijayawardene et al. 2018).