Cryptogamic Herbarium #3450
Department of Botany and Plant Pathology, Oklahoma Agriculture and Mech. College
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Iowa State University, Ada Hayden Herbarium
Catalog #: ISC-F-0083620
R.F. Cain #3450 21 August 1932
Erysiphe aggregata Farl.
Canada, Ontario, Stoneleigh, Muskoka
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