found lots of different oak galls (all of them on valley oak, Quercus lobata) this morning while i was out walking with zane. galls are caused by tiny cynipid wasps. the wasps lay their eggs on the oak trees' leaves or stems and in doing so trigger a reaction that causes the tree to create a gall around the egg where the larva will then develop.
here are some links with more photos and information:
http://joycegross.com/galls_ca_oak.php
https://en.wikipedia.org/wiki/Gall_wasp
and here is what zane and i found this morning...
neat. very.
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