[2] Galls of the agamic generation are small, ovoid, and occur in clusters along veins on the underside of leaves.

[2] They are covered by woolly cream- or pink-colored hair that becomes brown over the winter and sometimes wears away.

[2][4] Females emerge from these galls early in spring and oviposit in the buds of host oak trees.

[2] This induces the galls of the sexual generation, which are small ovoid cells within buds and young shoots; they cause little or no externally visible deformity.

[2] This species was first described by Homer Franklin Bassett as Cynips ignota in 1881 and has been included in various genera before its recent placement in Druon.