Andricus pattersonae (unisexual generation)
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This cynipid wasp induces thin, flat, detachable, monothalamous galls on the underside of leaves of most white oaks. The summer galls of the unisexual generation are usually light greenish yellow and measure 7-9 mm in diameter and 1mm thick.
”- Russo, Ronald A. : (2021) Plant Galls of the Western United States©