Basionym Name:Paxillus extenuatus Fr., Epicr. syst. mycol. (Upsaliae): 316 (1838)
Homotypic synonyms:Clitocybe extenuata (Fr.) S. Imai, J. Fac. agric., Hokkaido Imp. Univ., Sapporo 43(1): 88 (1938)