Rabbitbrush Gall
"Spiny Cone Gall"
genus Rhopalomyia

\Rhopalomyia gall
Spiny Cone Gall on Rabbitbrush in Mercur Canyon, Tooele County,
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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