Basionym Name:Hyalopus griseus Berk. & M.A. Curtis, in Berkeley, N. Amer. Fung.: no. 599 (1875)
Homotypic synonyms:Haplotrichum griseum (Berk. & M.A. Curtis) Pound & Clem., Minn. bot. Stud. 1(Bulletin 9): 672 (1896)