Basionym Name:Polyporus languidus Fr., Epicr. syst. mycol. (Upsaliae): 442 (1838)
Homotypic synonyms:Fomes languidus (Fr.) Sacc., Syll. fung. (Abellini) 6: 160 (1888)Fomes languidus var. languidus (Fr.) Sacc., Syll. fung. (Abellini) 6: 160 (1888)Polystictus languidus (Fr.) Fr., Nova Acta R. Soc. Scient. upsal., Ser. 3 1(1): 75 (1851)Scindalma languidum (Fr.) Kuntze, Revis. gen. pl. (Leipzig) 3(3): 519 (1898)