Quadruple Gall Apple in Scrub-oak

Quadruple Gall Apple in Scrub-oak, Santa Margarita Ecological Reserve, Temecula, California, April 2017.

Quadruple Gall Apple in Scrub-oak, Santa Margarita Ecological Reserve, Temecula, California, April 2017.

Oak apples are caused by insects – more information on Wikipedia.

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