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Crystalline Gall Wasp (Feron crystallinum)

The crystalline gall wasp (Feron crystallinum, formerly Andricus crystallinus) induces galls on the leaves of a variety of white oaks. Summer-generation (unisexual, containing only females) galls are covered in bristly hairs and generally form large, clustered masses on lower leaf surfaces. Spring-generation (bisexual, containing both females and males) galls are also hairy, but develop on upper leaf surfaces and do not form dense masses.


Crystalline gall wasp (Feron crystallinum), summer-generation galls on blue oak (Quercus douglasii). Focus-stacked composite of 18 exposures. Vacaville, Solano County, California, USA.
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Crystalline gall wasp (Feron crystallinum), developing gall on blue oak (Quercus douglasii). Focus-stacked composite of 81 exposures at 2x lifesize. Vacaville, Solano County, California, USA.
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Crystalline gall wasp (Feron crystallinum), galls on California scrub oak (Quercus berberidifolia). Stebbins Cold Canyon Reserve, Solano County, California, USA.
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Crystalline gall wasp (Feron crystallinum), galls on California scrub oak (Quercus berberidifolia). Stebbins Cold Canyon Reserve, Solano County, California, USA.
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Next Gall: Disc gall wasp (Feron parmula)



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All images copyright Timothy Boomer. All rights reserved worldwide.