A small larval cell hidden within the midrib of Notholithocarpus densiflorus, producing a very slight swelling. Noticeable as of November and (likely old) March when an emergence hole is visible. Sometimes causing the leaf to bend.

Adults reared from these galls (3 females emerged in January from galls collected in December in Mendocino County; 3 females emerged in March from galls collected in February in Sonoma County, CA) were analyzed by Dr. James Nicholls, and his preliminary result in June 2024 confirmed that they were Andricus notholithocarpi from galltype #4 (authors’ field code spCA18), which was previously only known by the sequencing of dissected larvae. Further morphological comparison by his team is needed to determine whether this is the same generation as other galltypes. (See also https://www.gallformers.org/gall/2484.)

- Gallformers Contributors: (2024) Gallformers ID Notes^©