Synonyms: Acia castanea; Acia fuscoatra (homotypic); Acia fuscoatrum; Acia uda grisea; Acia uda var. grisea; Acia weinmannii; Hydnum castaneum; Hydnum castaneum var. atrofuscum; Hydnum fuscoatrum (homotypic); Hydnum fuscoatrum castaneum; Hydnum fuscoatrum var. castaneum; Hydnum molariforme; Hydnum weinmannii; Mycoacia cinerea; Mycoleptodon corneus; Mycoleptodon fuscoater; Mycoleptodon fuscoater f. carnicolor; Mycoleptodon fuscoatrum; Odontia fuscoatra; Odontia grisea; Odontia weinmannii; Phlebia fuscoatra (homotypic); Radulum molariforme; Sarcodontia uda var. grisea; Sistotrema griseum; Sistotrema molariforme; Steccherinum corneum; Steccherinum fuscoatrum (homotypic)