Erysiphe polygoni DC.

NEW YORK BOTANICAL GARDEN
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Cornell University. Department of Plant Pathology
The Pennsylvania State College, department of Botany,
The New York Botanical Garden
145
No.............-----	V^GfcRDEU
Exysiphe.....polygon!.....DC................................................
._____________on 7rifolium pratense.........................
collected by £.0.OverhqltsjfeDennis ton
trout Run. Pa.. June 5-7, 1928