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Erineum galls on maple leafs.

An erineum gall is a gall caused by a eriophyid mite feeding on plant tissue. Unlike typical galls which are relatively large protrusions from the plant tissue, erineum galls form a velvety patch on the surface of the infected leaf. The eriophyid mites cannot be seen without the aid of a microscope. As with many other galls, the harm to the plant is largely cosmetic and results in no permanent damage.