Observation 10567: Cynipidae

When: 2008-09-06

Collection location: East Baton Rouge Parish, Baton Rouge, Louisiana, USA [Click for map]

Who: J. Williams (jwilliams)

No specimen available

Species Lists


Copyright © 2008
Copyright © 2008

Proposed Names

-15% (2)
Recognized by sight
35% (2)
Recognized by sight
28% (1)
Recognized by sight: Wasp gall, maybe similar to Andricus quercuscalifornicus, but outside of its range.
55% (1)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Thanks Debbie.
By: Daniel B. Wheeler (Tuberale)
2008-09-08 11:27:08 PDT (-0700)

It looks important to know what species of oak this was associated with. Apparently different species may appear at different locations on the tree. The only place I find oak galls on Quercus garryana are the leaves, and usually they remain attached to the leaf even after it has fallen.

Oak gall
By: Debbie Drechsler (debdrex)
2008-09-08 05:30:05 PDT (-0700)

In my area (Northern CA) there is an oak gall similar to yours that is formed on the stem. It’s not the same one but is called Andricus quercuscalifornicus.

Oak Leaf Gall
By: Daniel B. Wheeler (Tuberale)
2008-09-08 00:55:02 PDT (-0700)

Specimen does appear to be an oak leaf gall, an organic blister produced by an oak in response to a sting by certain insects on the leaf, causing the cells to enlarge and form this mostly hollow living quarters away from predating eyes. If I am correct, the gall should have been attached at some point to an actual oak leaf, if it is not currently attached. Examination of oak leaves still on trees should yield other galls nearby.

More information
By: J. Williams (jwilliams)
2008-09-07 11:42:39 PDT (-0700)

I couldn’t say. I didn’t know what galls are untill just now after searching the net.
I find these often. The colors fade over time and they eventually burst and expose a hollow inside. I assumed that this is the method for dispersing spores.

Without more verbal or pictorial info…
By: Debbie Drechsler (debdrex)
2008-09-07 08:22:21 PDT (-0700)

…what makes you think this is a fungus and not a gall?

Created: 2008-09-06 21:50:38 PDT (-0700)
Last modified: 2014-10-23 12:01:44 PDT (-0700)
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