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Asexual Gall

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36.2132, -119.212

Field Notes

Description:

Fungus or disease on an oak tree leaf

Habitat:

I found this on an oak tree leaf in California's Central Valley. Trying to identify what it is and what causes it.

Species ID Suggestions

Comments (2)
RebeccaRussellMustin
Asexual generation galls of Andricus kingi on valley oak leaf, Fremont. Thank you. That is exactly what they are. Interesting.
John La Salle
Most likely these are galls caused by an oak gall wasp from the family Cynipidae. http://en.wikipedia.org/wiki/Gall_wasp Compare them with this picture http://tywkiwdbi.blogspot.com.au/2011/03/galls-on-oak-leaf.html
Photographed
PublishedAugust 26, 2013

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