W.B. Cooke [1-450]

Cornell University, Plant Pathology Herbarium
Catalog #: WBC,Myc.N.A.0022
s.n.
Sphaerotheca humuli (DC.) Burrill

University of Wyoming, Wilhelm G. Solheim Mycological Herbarium
Catalog #: RMS0024499
13403 #s.n.
Sphaerotheca humuli (DC.) Burrill
United States, California, Siskiyou, along the Wagon Camp-Horse Camp Trail half a mile above Wagon Camp

Washington State University, Charles Gardner Shaw Mycological Herbarium
Catalog #: WSP21133
unknown s.n. 22 August 1939
Sphaerotheca humuli (DC.) Burrill
United States, California, along Wagon Camp-Horse Camp Trail, 1/2 mile above Wagon Camp