Galls of A. luminaria and A. bigeloviae A immature A. luminaria galls B internal view of immature A. luminaria gall with early instar larva burrowing into the stem while gall develops C mature A. luminaria galls D internal view of mature A. luminaria gall with full-sized larval chamber E mature A. bigeloviae galls F internal view of A. bigeloviae gall with a mature larva in the larval chamber. Side by side comparison of A. bigeloviae (left) and A. luminaria (right) tomentum texture and uniformity G external view H internal view.