1Institute of Botany, Azerbaijan National Academy of Sciences, 40 Badamdar Highway, Baku AZ1004, Azer-baijan;
2Graduate School of Bioresources, Mie University, 1577 Kurima-Machiya, Tsu 514-8507, Japan;
Samples of Polygonum alpinum and Alcea rosea infected by powdery mildews collected from Azerbai-jan were analyzed by using morphological and molecular methods. 28S rRNA gene including D1/D2 domains and ITS1/5.8S/ITS2 regions were determined for each specimen. Consequently, Golovinomy-ces spadiceus on P. alpinum and G. magnicellulatus on A. rosea were identified. Comprehensive mor-phological descriptions, illustrations of species and the results of molecular-phylogenetic analysis were given in the present article.