GALL
tiny pustules, consisting of a few enlarged cells only, often in large numbers on basal leaves. They consist of a single infected cell, surrounded by a 1-3 layers of not infected, yet swollen and discoloured cells. During summer the galls are yellow-orange to lavender, in autumn, when resting sporangia are formed, they are lavender-red to reddish brown.

HOST PLANTS
Onagraceae, oligophagous

Clarkia; Oenothera biennis, laciniata.