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Nuttall’s with Fasciation!
“A malformation of plant stems commonly appearing as enlargement and flattening as if several stems were fused is called fasciation.”

Found growing in a bed of Acer macrophyllum leaves up Arroyo Aguague. Larger individuals can be found growing near seeps where Woodwardia fimbriata was also found.

On scrub oak

Gall On a Coast Live Oak: Collected. Will Add picture of adult here once it emerges.