sp. nov., a new powdery mildew species on , belonging to the clade.

Powdery mildew was found on () in Jiangsu Province and Shandong Province, China. This fungus is characterized by having long conidiophore foot-cells which are straight or curved at the base, and chasmothecia with numerous appendages. Phylogenetic analysis using internal transcribed spacer sequences showed that five sequences on determined in this study and two sequences retrieved from sp.