Basionym: Boletus perennis Batsch, Elenchus fungorum: 103, t. 129 (1783) [MB#473493] Obligate synonyms: - Grifola badia (Pers.) Gray, A natural arrangement of British plants 1: 644 (1821) [MB#362181] - Polyporus durus (Timm) Kreisel, Boletus 8: 30 (1984) [MB#473284] - Boletus badius Pers., Synopsis methodica fungorum: 523 (1801) [MB#456026] - Boletus batschii J.F. Gmel., Systema Naturae 2 (2): 1435 (1792) [MB#468247] - Boletus durus Timm, Flora megapolitanae Prodomus exhibeus plantas ductatus Megapolitano: 271 (1788) [MB#372470] - Polyporellus badius (Pers.) Imazeki, Colored Illustrations of Mushrooms of Japan 2: 136 (1989) [MB#357729] - Royoporus badius (Pers.) A.B. De, Mycotaxon 65: 471 (1997) [MB#442513] Taxonomic synonyms: - Polyporus picipes Fr., Epicrisis Systematis Mycologici: 440 (1838) [MB#202776] - Melanopus picipes (Fr.) Pat., Les Hyménomycètes d'Europe: 137 (1887) [MB#469829] - Polyporellus picipes (Fr.) P. Karst., Meddelanden af Societas pro Fauna et Flora Fennica 5: 37 (1879) [MB#101010] - Leucoporus picipes (Fr.) Quél., Enchiridion Fungorum in Europa media et praesertim in Gallia Vigentium: 165 (1886) [MB#469790] - Polyporus trachypus Berk. & Mont., Sylloge generum specierumque plantarum cryptogamarum: 154 (1856) [MB#233068] - Polyporus aculeatus Sacc. & Traverso, Sylloge Fungorum 20: 496 (1911) [MB#156938] - Polyporus dibaphus Berk. & M.A. Curtis, Grevillea 1 (3): 36 (1872) [MB#196745] - Favolus trachypus Berk. & Mont., Sylloge generum specierumque plantarum cryptogamarum: 154 (1856) [MB#469178] - Grifola badia var. badia (Pers.) Gray: 644 (1821) [MB#587119] - Picipes badius (Pers.) Zmitr. & Kovalenko, International Journal of Medicinal Mushrooms 18 (1): 35 (2016) [MB#812028]