Clusters of several near-spherical galls emerging from the lower (or occasionally upper) midrib of Quercus montana in September and October in Pennsylvania. They differ from Andricus dimorphus in their uniform pubescence and regular spherical shape lacking a blunt, hairless outer face. They tend to occur in smaller numbers and sparser arrangements but can also be found in clusters of more than 20. They are initially white but often become longitudinally streaked with pink, sometimes more pink than white later in the season. They drop in late September and October, leaving small, round scars on the midrib.

Similar galls have been observed in North Carolina, Virginia, Tennessee, Ohio, and possibly DC. A similar gall has been observed on Quercus muehlenbergii in Ohio in August and September.