Erysiphe polygoni
DC.
KW [Darwin] 12273. Place of collection: Ukraine; Donetsk Oblast; Kamiani Mohyly reserve (N47°18' E37°05'). Date of collection: 6 June 1954. Associated organism: Polygonum persicaria (leaf). Collector: Boĭchuk, O.B.. Identifier: Heluta, V.P..