Podosphaera clandestina
(Wallr.) Lév.
KW [Darwin] 11788. Place of collection: Russia; Leningradskaya oblast; Vsevolozhskyi raion; Ostrovki village; Neva river, by (N59°47' E30°49'). Date of collection: 3 July 1915. Associated organism: Crataegus sp. (leaf). Collector: Ganeshin, S.S.. Identifier: Heluta, V.P..