A new species, Erysiphe dudkae V.P. Heluta, sp. nov. (Ascomycota, Erysiphales), on Brugmansia suaveolens (Humb. et Bonpl. ex Willd.) Bercht. et J. Presl (Solanaceae) is described. The fungus was collected by Irina O. Dudka in 2013 in Montenegro in two localities. It belongs to the section Microsphaera (Lév.) U. Braun et Shishkoff. Morphologically, E. dudkae is very similar to E. ornata var. europaea (U. Braun) U. Braun et S. Takam. parasitizing birch, but differs from it primarily by shape of appendages. In E. dudkae, appendages are horizontal or slightly raised, with straight or somewhat curved stalks, while in E. ornata var. europaea stalks are very curved, so that appendages are almost vertical.

Keywords: Erysiphales, Microsphaera, Europe

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