Blue Oaks

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The California Blue Oak
(Quercus douglasii)

Blue oaks (Quercus douglasii) in the northern Coast Range of California.

Blue oaks (Quercus douglasii) in the northern Coast Range of California.

Blue oaks (Quercus douglasii) in the northern Coast Range of California.

Characteristic glaucous leaf of a blue oak (Quercus douglasii).

Underside of a blue oak leaf (Quercus douglasii) showing a common cynipid gall (Andricus brunneus) attached to the midrib.

Close-up view of the undersides of blue oak leaves (Quercus douglasii) showing several fuzzy galls caused by the cynipid gall wasp (Andricus brunneus).

Close-up view of the undersides of blue oak leaves (Quercus douglasii) showing several fuzzy galls caused by the cynipid gall wasp (Andricus brunneus).

To Be Or Not To Be A Gall

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