This may be Kinsey's Neuroterus dubius, including but not limited to his variety clarkeae.

Small, tan-brown galls alone or in pairs on the lower midrib of white-group oaks as the leaves emerge in early May, causing distinct bends in the leaf at the attachment point. Their shape varies from round and nut-like to long and narrow. They are sparsely covered in white hairs swept toward the tip of the gall, not obscuring the surface.

The galls are of a similar size and shape to those of Neuroterus clarkeae and Andricus comata on Quercus alba, but differ in their placement at the midrib and the deformation of the leaf they cause. They match the descriptions given of Neuroterus bassetti in every respect except in being clearly distinct from the midvein, not a swelling of a vein. These galls may represent more than one species, possibly the undescribed sexual generations of one or more known species. Their form is close to a bare, unadorned larval cell, a reduced and therefore less distinctive gall than other cynipid galls.

Several distinct types have been observed, which may or may not represent different species.

Another, found on Quercus alba in Michigan (2) (3) (4) (5) (6) (7) (8), Virginia (2), and Pennsylvania, and on Quercus macrocarpa in Minnesota and Manitoba (2), has an ovate shape and appears both on the edge of the leaf and on the midrib, its distortion of the leaf somehow eliminating the lamina of the leaf between the gall and midrib.