Basionym Name:Agaricus achnous Berk. & Broome, J. Linn. Soc., Bot. 11(no. 56): 557 (1871)
Homotypic synonyms:Psathyrella achnoa (Berk. & Broome) Sacc., Syll. fung. (Abellini) 5: 1135 (1887)