Quercus imbricaria
Leaf galls, detachable
Ellipsoidal, 3 mm high by 1.7 mm in dia. Standing erect on upper surface in a group of about 20, nearly black. Cincinnati OH and St Louis MO.
- LH Weld: (1959) Cynipid galls of the eastern United States©
Reference: https://www.biodiversitylibrary.org/item/273718#page/68/mode/1up