Appears to be Cynips douglasii in early growth.
Hosted on presumed hybrid oak Quercus lobata × douglasii
Hosted on presumed hybrid oak Quercus lobata × douglasii
Leaf galls on black willow, Salix nigra.
Q. macrocarpa. q-macrocarpa-hairy-glob? (or saltatorius?) Spots on upper side of the leaf appear flat. Zillions of these galls on this tree. Sending two leaves with many galls to Forbes lab