Question: A broken red oak (I think) tree branch had many of these scary things on it. Are they some kind …
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Question
A broken red oak (I think) tree branch had many of these scary things on it. Are they some kind of gall? These pictures were taken on December 23, 2016, in the woods in Windsor, CT.
Answer
Dear David, these look to be gouty/horned oak galls that occur on the branches of species of Quercus. They are caused by species of Cynipid wasps. Thank you for sharing these images--I don't see these galls often. Best wishes.
