Basionym: Poria ferrugineofusca P. Karst., Meddelanden af Societas pro Fauna et Flora Fennica 14: 82 (1887) [MB#161293] Obligate synonyms: - Phellinus ferrugineofuscus (P. Karst.) Bourdot, Bull. Trimestriel Soc. Mycol. France 48: 228 (1932) [MB#252133] - Polyporus ferrugineofuscus (P. Karst.) Romell, Svenska Flora (Krypt.) ed. II: 220 (1898) [MB#455406] - Phellinidium ferrugineofusca (P. Karst.) Fiasson & Niemelä (1984) [MB#275338] - Poria ferruginea-fusca P. Karst. (1887) [MB#277929] - Fuscoporia ferrugineofusca (P. Karst.) Teng (?) [MB#586389] Taxonomic synonyms: - Polyporus marginellus Peck, Annual Report on the New York State Museum of Natural History 42: 122 (1889) [MB#226363] - Poria marginella (Peck) Sacc., Sylloge Fungorum 9: 194 (1891) [MB#198292] - Fuscoporia marginella (Peck) Murrill, North American Flora 9 (1): 5 (1907) [MB#469292] - Poria labyrinthica P. Karst., Hedwigia 30: 298 (1891) [MB#161239]