"several females of [Lasioptera clarkei [A. clarkei]] were reared 1/18/1909 from a whitish, circular, blister gall on the leaves of Aster macrophyllus collected by Cora H. Clarke at Magnolia, Mass., October 12, 1908. Evidently this form winters in the gall, and from the character of its nidus we would be inclined to refer it to the genus Asteromyia.... The galls formed by this species occur on the under side of the leaf, scarcely showing above. They are nearly circular, 2 to 3 mm in diameter, yellowish white and with an irregular, central, dark puncture..."
...
"yellowish or brownish blister leaf galls of [Asteromyia sylvestris [A. clarkei]] were very abundant October 22, 1914 on Aster cordifolius [Symphyotrichum cordifolium] at Mount Kisco NY…"

"The characteristic color of the galls is only in the epidermis, which is 1 cell layer thick. When the epidermis is peeled away, a mat of white fungal tissue can be seen below...hard, black carbonaceous material...encases the larva or larvae."

[He lists the following host records for this species, verified by both host and insect identification: Aster claytoni [Eurybia divaricata], Aster cordifolius [Symphyotrichum cordifolium], Aster divaricatus [Eurybia divaricata], Aster gracilis [Eurybia compacta], Aster macrophyllus [Eurybia macrophylla], Aster paludosus [Eurybia paludosa], Aster radula [Eurybia radula], Aster spectabilis [Eurybia spectabilis], Aster surculosus [Eurybia surculosa]]

[Additionally, he lists Eurybia radulina as a possible Asteromyia sp. host based on observations of galls only (no insect material was available). Included here, provisionally, because the host is in the same genus as most (all?) A. clarkei hosts, but these gall records may alternatively represent a distinct midge species.]

Asteromyia species were identified using characters of mature larval and pupa (particularly the shape of the sternal spatula) using Gagné (1968) and with reference to gall morphology and host-plant affiliation (Gagné, 1968, 1994). All galls were categorized as to whether a thick mat of fungal hyphae or hyphal stroma was present or absent.
...
[from Appendix A – "Samples used mtDNA analyses with host-plants, collection site, and Genbank accession number", hosts sampled included: Eurybia divaricata, E. macrophylla]