"Spiny Cone Gall"
Spiny Cone Gall on Rabbitbrush in Mercur Canyon, Tooele
Utah. These are caused by the Rhopalomyia
species of midge.
You can read more about plant galls, including these (pg 292)
in Field Guide to Plant Galls of California and Other
Western States by Ron Russo. © Carol Davis 4-12-2017
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