Synonymy:
Hydnum udum Fr., Systema Mycologicum 1: 422 (1821)
Acia uda (Fr.) P. Karst., Meddn Soc. Fauna Flora fenn. 5: 42 (1879)
Acia uda (Fr.) P. Karst., Meddn Soc. Fauna Flora fenn. 5: 42 (1879) var. uda
Acia uda (Fr.) P. Karst., Meddn Soc. Fauna Flora fenn. 5: 42 (1879) subsp. uda
Odontia uda (Fr.) Bres., Atti Imp. Regia Accad. Rovereto, Ser. 3 3(1): 97 (1897)
Mycoacia uda (Fr.) Donk, Medded. Nedl. Mycol. Ver. 18-20: 151 (1931)
Sarcodontia uda (Fr.) Nikol., Fl. pl. crypt. URSS 6(2): 182 (1961)
Sarcodontia uda (Fr.) Nikol., Fl. pl. crypt. URSS 6(2): 182 (1961) var. uda
Phlebia uda (Fr.) Nakasone, Sydowia 49(1): 72 (1997)

Sistotrema griseum Pers., Mycologia Europaea (Erlanga) 2: 198 (1825)
Odontia grisea (Pers.) Bres., Annls mycol. 1(1): 85 (1903)
Acia uda var. grisea (Pers.) Bourdot & Galzin, Hyménomyc. de France (Sceaux): 414 (1928) [1927]
Sarcodontia uda var. grisea (Pers.) Nikol., Flora Plantarum Cryptogamarum URSS 6, Fungi 2: 181 (1961)

Hydnum sepultum Berk. & Broome, Ann. Mag. nat. Hist., Ser. 5 3(no. 15): 210 (1879)
Odontia sepulta (Berk. & Broome) Rea, Brit. basidiomyc. (Cambridge): 650 (1922)

Position in classification:
Mycoaciella, Meruliaceae, Polyporales, Incertae sedis, Agaricomycetes, Basidiomycota, Fungi

Note:
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