• Hydnum Linnaeus, 1753
• Hydnum abietinum (Pers.) Duby, 1830 accepted as Ramaria abietina (Pers.) Quél., 1888
• Hydnum abietinum Schrad., 1794 accepted as Hericium coralloides (Scop.) Pers., 1794
• Hydnum abietis Weir ex Hubert, 1931 accepted as Hericium abietis (Weir ex Hubert) K.A. Harrison, 1964
• Hydnum aciculare Sacc., 1880 accepted as Hericium coralloides (Scop.) Pers., 1794
• Hydnum acre Quél., 1878 accepted as Hydnellum compactum (Pers.) P. Karst., 1880
• Hydnum adpressum Lloyd, 1916 accepted as Sarcodon imbricatus (L.) P. Karst., 1881
• Hydnum adustum Schwein., 1822 accepted as Steccherinum adustum (Schwein.) Z.S. Bi & G.Y. Zheng, 1984
• Hydnum agardhii Fr., 1814 accepted as Dacryobolus sudans (Alb. & Schwein.) Fr., 1849
• Hydnum aitchisonii Berk., 1876 accepted as Mycoleptodonoides aitchisonii (Berk.) Maas Geest., 1961
• Hydnum alachuanum (Murrill) Murrill, 1940 accepted as Hydnellum caeruleum (Hornem.) P. Karst., 1880
• Hydnum albonigrum Peck, 1897 accepted as Phellodon melaleucus (Sw. ex Fr.) P. Karst., 1881
• Hydnum alboviride Morgan, 1887 accepted as Kavinia alboviridis (Morgan) Gilb. & Budington, 1970
• Hydnum album Pers., 1818 accepted as Hydnum repandum Linnaeus, 1753
• Hydnum alliaceum Weinm., 1832 accepted as Trechispora fastidiosa (Pers.) Liberta, 1966
• Hydnum alutaceum Fr., 1821 accepted as Hyphodontia alutacea (Fr.) J. Erikss., 1958
• Hydnum ambiguum Berk. & Broome, 1875 accepted as Odontiopsis ambigua (Berk. & Broome) Hjortstam, 1987
• Hydnum ambustum Cooke & Massee, 1887
• Hydnum amicum Quél., 1880 accepted as Phellodon confluens (Pers.) Pouzar, 1956
• Hydnum arachnoideum Peck, 1891 accepted as Scytinostroma arachnoideum (Peck) Gilb., 1963
• Hydnum argutum Fr., 1821 accepted as Hyphodontia arguta (Fr.) J. Erikss., 1958
• Hydnum aspratum Berk., 1882 accepted as Sarcodon imbricatus (L.) P. Karst., 1881
• Hydnum aterrimum Fr., 1821 accepted as Xenotypa aterrima (Fr.) Petr., 1955
• Hydnum atrotomentosum Schwalb, 1891 accepted as Auriscalpium vulgare Gray, 1821
• Hydnum atroviride Morgan, 1895 accepted as Sarcodon atroviridis (Morgan) Banker, 1906
• Hydnum aurantiacum (Batsch) Alb. & Schwein., 1825 accepted as Hydnellum aurantiacum (Batsch) P. Karst., 1880
• Hydnum aurantium Raf., 1813 accepted as Hydnum repandum Linnaeus, 1753
• Hydnum auratile Britzelm., 1891 accepted as Hydnellum auratile (Britzelm.) Maas Geest., 1959
• Hydnum aureum Fr., 1828 accepted as Mycoacia aurea (Fr.) J. Erikss. & Ryvarden, 1976
• Hydnum auriscalpium Linnaeus, 1753 accepted as Auriscalpium vulgare Gray, 1821
• Hydnum australe Lloyd, 1919 accepted as Climacodon pulcherrimus (Berk. & M.A. Curtis) M.I. Nikol., 1961
• Hydnum badium Pers., 1825 accepted as Sarcodon imbricatus (L.) P. Karst., 1881
• Hydnum ballouii (Banker) Sacc. & Trotter, 1912 accepted as Echinodontium ballouii (Banker) H.L. Gross, 1964
• Hydnum bambusinum R.E.D. Baker & W.T. Dale, 1951 accepted as Sarcodon atroviridis (Morgan) Banker, 1906
• Hydnum barba-jovis Bull., 1791 accepted as Hyphodontia barba-jovis (Bull.) J. Erikss., 1958
• Hydnum basiasperatum Henn., 1897 accepted as Steccherinum reniforme (Berk. & M.A. Curtis) Banker, 1906
• Hydnum basibadium (Banker) Sacc. & Trotter, 1925 accepted as Steccherinum basibadium Banker, 1912
• Hydnum beneolens Bres., 1925 accepted as Grifola sordulenta (Mont.) Singer, 1962
• Hydnum bicolor Alb. & Schwein., 1805 accepted as Resinicium bicolor (Alb. & Schwein.) Parmasto, 1968
• Hydnum bicolor Raddi, 1807 accepted as Hydnum repandum Linnaeus, 1753
• Hydnum bienne (Bull.) Lam. & DC., 1805 accepted as Abortiporus biennis (Bull.) Singer, 1944
• Hydnum blackfordiae Peck, 1906 accepted as Sarcodon atroviridis (Morgan) Banker, 1906
• Hydnum boreale Banker, 1902 accepted as Hydnellum suaveolens (Scop.) P. Karst., 1880
• Hydnum boveanum Mont., 1835 accepted as Gyrodontium boveanum (Mont. ex DC.) Maas Geest., 1964
• Hydnum brevipes (Coker) Snell, 1945 accepted as Sarcodon stereosarcinon Wehm., 1940
• Hydnum bulbosum Raddi, 1807 accepted as Hydnum repandum Linnaeus, 1753
• Hydnum caeruleum Hornem., 1825 accepted as Hydnellum caeruleum (Hornem.) P. Karst., 1880
• Hydnum calcareum Cooke & Massee, 1892 accepted as Pseudolagarobasidium calcareum (Cooke & Massee) Sheng H. Wu, 1990
• Hydnum calvatum K.A. Harrison, 1964 accepted as Sarcodon calvatus (K.A. Harrison) K.A. Harrison, 1984
• Hydnum calvum Alb. & Schwein., 1805 accepted as Mucronella calva (Alb. & Schwein.) Fr., 1874
• Hydnum candidum Willd., 1788 accepted as Hyphodontia quercina (Pers.) J. Erikss., 1958
• Hydnum caput-medusae (Bull.) Pers., 1780 accepted as Hericium erinaceus (Bull.) Pers., 1797
• Hydnum caput-ursi Fr., 1863 accepted as Hericium coralloides (Scop.) Pers., 1794
• Hydnum carbonarium G. Cunn., 1958 accepted as Sarcodon thwaitesii (Berk. & Broome) Maas Geest., 1964
• Hydnum carnosum (Banker) Sacc., 1925 accepted as Bankera violascens (Alb. & Schwein.) Pouzar, 1955
• Hydnum casearium Morgan, 1887 accepted as Radulodon casearius (Morgan) Ryvarden, 1972
• Hydnum castaneum Alb. & Schwein., 1805 accepted as Mycoacia fuscoatra (Fr.) Donk, 1931
• Hydnum cerasi (Pers.) DC., 1815 accepted as Hyphodontia radula (Pers.) Langer & Vesterh., 1996
• Hydnum chlorascens Pat., 1902 accepted as Kavinia alboviridis (Morgan) Gilb. & Budington, 1970
• Hydnum chrysorhizon Torr., 1822 accepted as Phanerochaete chrysorhizon (Torr.) Budington & Gilb., 1973
• Hydnum ciliolatum Berk. & M.A. Curtis, 1849 accepted as Steccherinum ciliolatum (Berk. & M.A. Curtis) Gilb. & Budington, 1970
• Hydnum cinereum sensu Carleton Rea (1922) accepted as Phellodon niger (Fr.) P. Karst., 1881
• Hydnum cirrhatum Pers., 1794 accepted as Hericium cirrhatum (Pers.) Nikol., 1950
• Hydnum clandestinum Batsch, 1783 accepted as Hydnum repandum Linnaeus, 1753
• Hydnum clathroides Pall., 1773 accepted as Hericium clathroides (Pall.) Pers., 1797
• Hydnum clavarioides Berk. & M.A. Curtis, 1868 accepted as Gyrodontium sacchari (Spreng.) Hjortstam, 1995
• Hydnum compactum Pers., 1800 accepted as Hydnellum compactum (Pers.) P. Karst., 1880
• Hydnum complicatum (Banker) Sacc. & Trotter, 1912 accepted as Hydnellum complicatum Banker, 1906
• Hydnum concrescens Pers., 1796 accepted as Hydnellum concrescens (Pers.) Banker, 1906
• Hydnum confluens Peck, 1825 accepted as Phellodon confluens (Pers.) Pouzar, 1956
• Hydnum confluens Pers., 1825 accepted as Phellodon confluens (Pers.) Pouzar, 1956
• Hydnum connatum Rick, 1959 accepted as Phellodon tomentosus (L.) Banker, 1906
• Hydnum copelandii Pat., 1914 accepted as Radulodon copelandii (Pat.) N. Maek., 1993
• Hydnum coralloides Scop., 1772 accepted as Hericium coralloides (Scop.) Pers., 1794
• Hydnum corrugatum Fr., 1818 accepted as Hericium cirrhatum (Pers.) Nikol., 1950
• Hydnum crassum K.A. Harrison, 1961 accepted as Sarcodon versipellis (Fr.) Nikol., 1961
• Hydnum crinale Fr., 1838 accepted as Tomentella crinalis (Fr.) M.J. Larsen, 1967
• Hydnum cristatum Bres., 1902 accepted as Hydnellum cristatum (Bres.) Stalpers, 1993
• Hydnum cristulatum Fr., 1821 accepted as Hyphoderma cristulatum (Fr.) Donk, 1957
• Hydnum croceum (Schwein.) Fr., 1828 accepted as Sarcodontia crocea (Schwein.) Kotl., 1953
• Hydnum crocidens Cooke, 1890 accepted as Hydnum ambustum Cooke & Massee, 1887
• Hydnum crustosum (Pers.) Pers., 1801 accepted as Hyphodontia crustosa (Pers.) J. Erikss., 1958
• Hydnum cyaneotinctum Peck, 1903 accepted as Hydnellum caeruleum (Hornem.) P. Karst., 1880
• Hydnum cyathiforme Schaeff., 1774 accepted as Phellodon tomentosus (L.) Banker, 1906
• Hydnum daviesii Sowerby, 1796 accepted as Steccherinum ochraceum (Pers.) Gray, 1821
• Hydnum decipiens (Willd.) Schrad., 1794 accepted as Trichaptum fuscoviolaceum (Ehrenb.) Ryvarden, 1972
• Hydnum decurrens Berk. & M.A. Curtis, 1868 accepted as Steccherinum ochraceum (Pers.) Gray, 1821
• Hydnum decurrens Berk., 1891 accepted as Antrodiella zonata (Berk.) Ryvarden, 1992
• Hydnum delicatum Schwein., 1832 accepted as Phellodon melaleucus (Sw. ex Fr.) P. Karst., 1881
• Hydnum denticulatum Pers., 1825 accepted as Steccherinum ochraceum (Pers.) Gray, 1821
• Hydnum denticulatum sensu auct. accepted as Steccherinum ochraceum (Pers.) Gray, 1821
• Hydnum denticulatum sensu auct. accepted as Mycoaciella bispora (Stalpers) J. Erikss. & Ryvarden, 1978
• Hydnum diabolus (Banker) A.H. Sm., 1949 accepted as Hydnellum peckii Banker, 1912
• Hydnum diaphanum Schrad., 1794 accepted as Mycoacia aurea (Fr.) J. Erikss. & Ryvarden, 1976
• Hydnum dichroum Pers., 1825 accepted as Steccherinum ochraceum (Pers.) Gray, 1821
• Hydnum diffractum Berk., 1847 accepted as Hydnum repandum Linnaeus, 1753
• Hydnum dissitum Berk. & Cooke, 1876 accepted as Dentipellis dissita (Berk. & Cooke) Maas Geest., 1974
• Hydnum diversidens Fr., 1821 accepted as Hericium cirrhatum (Pers.) Nikol., 1950
• Hydnum durieui Sacc., 1888
• Hydnum earleanum Sumst., 1904 accepted as Sarcodontia setosa (Pers.) Donk, 1952