Gall on an oak leaf. - Andricus pattoni
Moncks Corner, Berkeley County, South Carolina, USA
October 13, 2015
Size: 1.5-2.0 cm wide
Gall on the leaf of what may be a Quercus austrina x stellata hybrid. Edge of a damp woodland. I suspect the insect that formed this is Andricus pattoni (Cynipidae).