Erysiphe symphoricarpi -powdery mildew fungus infecting western snowberry (Symphoricarpos occidental

Erysiphe symphoricarpi -powdery mildew fungus infecting western snowberry (Symphoricarpos occidentalis). Chasmothecia were densely clustered on the leaves. The appendages of the chasmothecia are clearly dichotomously branched, tips not recurved.