Erysiphe polygoni DC.

KW [Darwin] 11550. Place of collection: Ukraine; Mykolaiv Oblast; Pervomaisk District; Krimka village; Kodimi river (side); Katerinka forest plot (N47°56' E30°45'). Date of collection: 4 September 1985. Associated organism: Polygonum aviculare (leaf). Collector: Dudka, I.O.. Identifier: Heluta, V.P..