Bulges and tan asci on leaves of black oak infected with oak leaf blister fungus, Taphrina caerulescens.

Yellowish bulges on upper surface and tan asci sporulation on underside of California black oak, Quercus kelloggii, from oak leaf blister, Taphrina caerulescens. Berkeley, Alameda Co. by JKC.  Credit: Jack Kelly Clark
Bulges and tan asci on leaves of black oak infected with oak leaf blister fungus, Taphrina caerulescens. Credit: Jack Kelly Clark