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

USDA United States National Fungus Collections
Catalog #: BPI 1020538
s.n.
Sphaerotheca castagnei Lév.
United States

USDA United States National Fungus Collections
Catalog #: BPI 1020539
s.n.
Sphaerotheca castagnei Lév.
United States

Cornell University, Plant Pathology Herbarium
Catalog #: S.E.,Econ.F.0300
B. D. Halsted s.n.
Sphaerotheca

University of Wisconsin-Madison Herbarium
Catalog #: WIS-F-0056435
Bryon D. Halsted #s.n. 01 September 1892
Sphaerotheca humuli var. fuliginea (Schltdl.) E.S. Salmon
United States, New Jersey, New Brunswick;