Ascomyceten #2000
Rehm, Ascomyc.
H. Rehm [1-2175, plus extras]

Cornell University, Plant Pathology Herbarium
Catalog #: CUP-F-2219
John Dearness #3495 00 August 1911
Sphaerotheca humuli (DC.) Burrill
Canada, Ontario, Middlesex, London;