Erysiphe horridula (Wallr.) Rabenh.

Rabeohorst, Herb, mycologicum. Ed. II.
481. Erysibe Iiorrfdnla Rabenli. Hdb. 1. p. 235.
d. Dryadearatn Rabeub. 1. c.
Forma: Comari polastrfts.
Ad Schwerin (Flor. Megapol.) leg. Dr. Fiedler.
NEW YORK BOTANICAL GARDEN
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