Translucent Oak Galls
One of my all-time favorite plant galls is the appropriately named Translucent Oak Gall. The galls are produced by the gall-wasp, Amphibolips nubilipennis (family Cynipidae). They arise from a leaf vein on the lower leaf surface and measure around 1/2 - 3/4" in diameter. Their shape and color causes them to strongly resemble tiny, pink balloons or pink grapes hanging beneath the leaves of red, scarlet, and black oaks.
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