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Callirhytis sp.
Horned galls are the most common spiked variety on oaks. Caused by the Callirhytis wasp, these galls are seen on pin, black and water oaks. The galls vary in size and are covered in hornlike projections.
temperate forest, on an oak tree
I spotted this at Baden Powell park. This was the first time I've seen this.
Spotted on Aug 27, 2011
Submitted on Aug 27, 2011
6 Comments
Thanks for the ID and info Emma.
@ Dan, These seem to be Horned galls caused by the " Callirhytis wasp"
Horned galls are the most common spiked variety on oaks. Caused by the Callirhytis wasp, these galls are seen on pin, black and water oaks. The galls vary in size and are covered in hornlike projections.
Xanthoteras gall wasps cause spiny vase galls, which resemble small pitchers or vases. This variety is covered in very small red or yellow spikes and they appear in the fall.
The hedgehog gall, initiated by Acraspis erinacei, occurs on the leaves of white oaks and has numerous short spines.
http://www.ehow.com/info_7961505_spiky-b...
Thank emj and yes, isn't it, Emma? Would be great to find an ID.
@ Dan ,this is really interesting.
Great sequence of shots, showcases it really well!