Callirhytis fructuosa
Quercus coccinea, falcata, ilicifolia, marilandica, palustris, rubra, texana [buckleyi], velutina
Acorn galls
A stony-hard, many-celled mass inside mature acorns in the fall, crowding the cotyledons.
[Photo caption]
On Q coccinea. Also on Q velutina, rubra, palustris, marilandica, ilicifolia, falcata, texana [buckleyi]. In August the red squirrels cut open the affected acorns for the well-developed larvae. From acorns of Q marilandica from Batesburg SC another Callirhytis emerged the second spring Apr 17-May 3.
- LH Weld: (1959) Cynipid galls of the eastern United States©
Reference: https://www.biodiversitylibrary.org/item/273718#page/111/mode/1up