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Image Library > Plant Galls > White Oak Galls > 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. All images copyright Timothy Boomer. All rights reserved worldwide. |