A small spring bare cell gall similar to the sexual generation of Phylloteras poculum. This may be the sexual generation of Phylloteras volutellae?

Found on Quercus bicolor (2) (3) and montana, is perpendicular to the blade of the leaf and narrowly tapered, appearing as if it were a short branch of the midrib.

Another, found on Quercus bicolor in Michigan

The final type, observed on Quercus bicolor (2) (3) (4) (5) (6) (7) (8) (9) (10), is more nut-like in shape and found on the lower midrib, curling but not eliminating the lamina on its side of the leaf.