Basionym Name:Agaricus difformis Pers., Syn. meth. fung. (Göttingen) 2: 462 (1801)
Homotypic synonyms:Camarophyllus difformis (Pers.) P. Karst., Bidr. Känn. Finl. Nat. Folk 32: 229 (1879)Clitocybe difformis (Pers.) Sacc., Syll. fung. (Abellini) 5: 191 (1887)Omphalia difformis (Pers.) Quél., Enchir. fung. (Paris): 26 (1886)