Basionym: Hydnum caeruleum Hornem., Fl. Dan. 8 (23): 7 (1808) [MB#169416] Obligate synonyms: - Calodon caeruleus (Hornem.) P. Karst., Bidrag till Kännedom av Finlands Natur och Folk 37: 106 (1882) [MB#450935] - Hydnum suaveolens var. caeruleum (Hornem.) Fr., Systema Mycologicum 1: 402 (1821) [MB#137511] Taxonomic synonyms: - Sarcodon alachuanus Murrill, Bulletin of the Torrey Botanical Club 67: 275 (1940) [MB#290754] - Hydnum alachuanum (Murrill) Murrill, Bulletin of the Torrey Botanical Club 67: 281 (1940) [MB#287089] - Hydnellum alachuanum (Murrill) Coker & Beers, The stipitate hydnums of the eastern United States: 66 (1951) [MB#298544] - Hydnellum ferrugipes Coker, Journal of the Elisha Mitchell Scientific Society 34: 188 (1919) [MB#469492] - Calodon ferrugipes (Coker) Snell, Mycologia 37 (1): 48 (1945) [MB#284712] - Hydnum cyaneotinctum Peck, Bulletin of the Torrey Botanical Club 30: 98 (1903) [MB#244103] - Calodon cyaneotinctus (Peck) Snell, Mycologia 37 (1): 51 (1945) [MB#284711] - Hydnellum cyaneotinctum (Peck) Banker, Memoirs of the Torrey Botanical Club 12: 164 (1906) [MB#469491] - Hydnum fulvocaeruleum Britzelm. (1894) [MB#163509] - Hydnellum inquinatum Banker, Mycologia 5 (4): 202 (1913) [MB#469497] - Hydnum inquinatum (Banker) Trotter, Sylloge Fungorum 23: 472 (1925) [MB#195702] - Hydnellum coeruleum (Hornem.) P. Karst. (1879) [MB#265706] - Sarcodon alachuanum Murrill, Bulletin of the Torrey Botanical Club 67: 275 (1940) [MB#280708] - Hydnum fulvocoeruleum Britzelm., Berichte des Naturwissenschaftlichen Vereins Schwaben Neuburg 31: 176 (1894) [MB#536346]