Basionym:
Fomes robustus P. Karst., Bidrag till Kännedom av Finlands Natur och Folk 48: 467 (1889) [MB#169415]
Obligate synonyms:
- Phellinus robustus (P. Karst.) Bourdot & Galzin, Bull. Soc. Mycol. France 41 (1-2): 188 (1925) [MB#142852]
- Polyporus robustus (P. Karst.) S. Lundell & Nannf., Fungi Exsiccati Suecici Fasc. 5-6: no. 245 (1936) [MB#254418]
- Scindalma robustum (P. Karst.) Kuntze, Revisio generum plantarum 3 (3): 519 (1898) [MB#471514]
- Ochroporus robustus (P. Karst.) J. Schröt. ex Donk, Mededelingen van het botanisch Museum en Herbarium van de Rijksuniversiteit Utrecht 9: 248 (1933) [MB#254417]
- Polyporus igniarius subsp. robustus (P. Karst.) Romell, Sv. Fl. Skol., Krypt. ed. 3: 266 (1907) [MB#663799]
Taxonomic synonyms:
- Fomes igniarius var. robustus Fr. & Cooke (?) [MB#493963]
- Pyropolyporus bakeri Murrill, North American Flora 9 (2): 104 (1908) [MB#199545]
- Phellinus bakeri (Murrill) A. Ames, Annales Mycologici 11 (3): 246 (1913) [MB#470445]
- Fomes bakeri (Murrill) Sacc. & Trotter, Sylloge Fungorum 21: 293 (1912) [MB#157753]
- Fomitiporia bakeri (Murrill) J. Vlasak & J. Kout, Mycological Progress 10 (4): 450 (2010) [MB#518865]
- Polyporus bakeri (Murrill) Bres. (?) [MB#180326]
- Polyporus buxi Branke, Izv. vyssh. ucheb. Zaved.: 473 (1894) [MB#472461]
- Pyropolyporus crustosus Murrill, Bulletin of the Torrey Botanical Club 30 (2): 113 (1903) [MB#173699]
- Fomes crustosus (Murrill) Sacc. & D. Sacc., Sylloge Fungorum 17: 119 (1905) [MB#233158]
- Pyropolyporus haematoxyli Murrill, Bulletin of the Torrey Botanical Club 30 (2): 117 (1903) [MB#173546]
- Fomes haematoxyli (Murrill) Sacc. & D. Sacc., Sylloge Fungorum 17: 118 (1905) [MB#196204]
- Fomes squarrosus Lloyd, Mycol. Writ. 4 (Letter 53): 10 (1914) [MB#469247]
- Fomes rhaponticus Lloyd, Synopsis of the genus Fomes (7): 258 (1915) [MB#175728]
- Pyropolyporus abramsianus Murrill, Western Polypores (5): 26 (1915) [MB#199642]
- Fomes abramsianus (Murrill) Sacc. & Trotter, Sylloge Fungorum 23: 397 (1925) [MB#469188]
- Fomes abramsianus (Murrill) Murrill, Mycologia 7 (4): 215 (1915) [MB#545861]
- Fomes ungulatus Lázaro Ibiza, Revista de la Real Academia de Ciencias Exactas Fisicas y Naturales Madri 14: 663 (1916) [MB#188193]
- Ungularia tuberosa Lázaro Ibiza, Revista de la Real Academia de Ciencias Exactas Fisicas y Naturales Madri 14: 672 (1916) [MB#177564]
- Fomes tuberosus (Lázaro Ibiza) Sacc. & Trotter, Sylloge Fungorum 23: 388 (1925) [MB#191077]
- Fomes yasudai Lloyd (1915) [MB#241781]
- Polyporus aestriplex E.H.L. Krause, Basidiomycetium Rostockienses, Suppl. 3: 122 (1931) [MB#470797]
- Phellinus aestriplex (E.H.L. Krause) E.H.L. Krause, Mecklenburgs Basidiomyceten: 23 (1934) [MB#470443]
- Agaricus aestriplex (E.H.L. Krause) E.H.L. Krause, Basidiomycetum Rostochiensium, Suppl. 4: 142 (1932) [MB#467979]
- Fomes yasudae Lloyd, Synopsis of the genus Fomes (7): 272 (1915) [MB#535121]