Diplolepis is a genus of cynipid wasp that induces galls on our native wild roses. I'd never noticed them before this spring. Recently I stumbled across two different species that produce similar spiny galls. The first, D. bicolor, occurs along the stem; I saw it in Armstrong Redwoods State Park. The second, D. polita, grows on the leaf (photo below); these were at Hidden Villa. D. bicolor has the honor of being the cover photo of Ronald Russo's wonderful guide, Plant Galls of the Western United States. Lucky gall!
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