Ascomyceten #1975
Rehm, Ascomyc.
H. Rehm [1-2175, plus extras]

Cornell University, Plant Pathology Herbarium
Catalog #: CUP-F-1671
John Dearness #3331 00 October 1910
Microsphaera alni (DC.) G. Winter
Canada, Ontario, Middlesex, London;