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About the size of a ping pong ball, looks very papery. Is mostly brown, with small spots of black, very wrinkly. On the inside, there is a small dark solid..ball? in the middle, with thin tan tubes radiating to the edge of the sphere.
Forest
I'm unsure of which oak species the tree is, but photos of the leaves can be found here: http://www.projectnoah.org/spottings/830.... Found at Barbara A. Beiser Field Station.
This was made by a type of wasp! I love how the insides of these galls look.