Andricus incertus on swamp white oak (Q. bicolor) acorn. (All the below are on various swamp white oaks as well.)
A cluster of Oak Rough Bulletgall Wasp galls (Disholcaspis quercusmamma). Note the ants and bee.
Bald-faced Hornet and Asian Lady Beetle, too. In fact, I found several with lady beetles on them. Are the galls extruding something sweet to eat?
This one is out of the ordinary, if any of these extraordinary gall structures can be called ordinary. Andricus quercusstrobilanus. (You’ll be noticing a number of these things don’t have common names.)
Oak Rosette Gall Wasp (Andricus quercusfrondosus).
And fresh versions of the same.
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This work by Matthew Wills is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.
Backyard and Beyond 
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