Department of Botany and Plant Pathology, Oklahoma Agriculture and Mech. College

University of Wisconsin-Madison Herbarium
Catalog #: WIS-F-0056386
H. S. Jackson #s.n. 04 October 1933
Sphaerotheca humuli var. fuliginea (Schltdl.) E.S. Salmon
Canada, Ontario, Toronto; Humber R.