A.B. Seymour and F.S. Earle [1-550, plus extras]

USDA United States National Fungus Collections
Catalog #: BPI 604334
Halsted Byron D. s.n. 01 September 1892
Sphaerotheca humuli var. fuliginea (Schltdl.) E.S. Salmon
United States, New Jersey, New Brunswick