Plagiotrochus punctatus Bass
Bi-sexual form,
Blister-like leaf galls, on or near veins, length 1-2 mm.
On Q rubra
Blister-like, narrowly oval galls on or near the veins, length 1/25 to 1/12 inch, on Spanish oak, early summer, sexual generation, gall wasp.
”- EP Felt: (1940) Plant Galls and Gall Makers©
Reference: https://babel.hathitrust.org/cgi/pt?id=wu.89041294323&view=1up&seq=37