Abstract In central Europe, including Germany, Telekia speciosa (heart-leaved oxeye) is a synanthropic, non-native plant species commonly grown as an ornamental plant. A powdery mildew has recently been introduced on this host in Germany. This previously assigned to Golovinomyces cichoracearum (≡ Erysiphe ) sensu lato. Two German specimens of have sequenced and phylogenetically analysed. The an...