On Canyon Live Oak.
Probably the same gall (there's more here too) I saw a couple years ago on Canyon Live Oak.
Upper surface of leaf https://gallformers.org/gall/1511
https://gallformers.org/gall/1380
https://gallformers.org/gall/1607
Underside of Coast Live Oak (Quercus agrifolia) leaf.
A. viscida
gall
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