Callirhytis serricornis, formerly Andricus serricornis, the kernel flower gall wasp, is a species of hymenopteran that produces galls on oak trees in California in North America.

The wasp oviposits on coast live oak and interior live oak and induces a gall shaped roughly like a bottle or vase.

The gall is brown in the first generation, and red and green in the second.

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