Oak Gall, induced by a Cynipid Wasp
Northern Sierra Nevada, California, USA
This bizarre growth on a leaf of Quercus vacciniifolia is induced by the larva of a small wasp in the family Cynipidae, which lives inside feeding on plant tissue.
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This image was captured with a Canon EOS D60, with a Canon 65/2.8 MPE 1-5x Macro lens.