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Home » Guide » Arthropods (Arthropoda) » Unidentified Tracks, Sign, and Other Mysteries » Unidentified Galls
Photo#727064
Gall? on spirea
Copyright © 2012 Christine Hanrahan

Gall? on spirea
Mer Bleue conservation area, Ottawa-Carleton, Ontario, Canada
June 5, 2012
Size: less than one inch
I found several of what I assume are galls on a Spirea alba near a cattail marsh.

Images of this individual: tag all
Gall? on spirea Gall? on spirea
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Contributed by Christine Hanrahan on 30 November, 2012 - 9:48pm
Last updated 1 December, 2012 - 12:44pm

Moved
Moved from ID Request.
… John F. Carr, 1 December, 2012 - 12:44pm login or register to post comments

What part of the plant?
What part of the plant are these on, i.e. what was modified to form the galls? Flower, stem, leaf vein, leaf membrane, ...? Is there supposed to be a flower in the spot where the other photo shows a gall? Many Cecidomyiidae are on Spiraea.
… John F. Carr, 30 November, 2012 - 10:23pm login or register to post comments

 
Spirea plant
Thank you. The first photo, the very red gall, was at the top of the plant where flowers would be growing in a cluster, but there were no flowers on this plant. The second gall was, in the other photo, was on the same plant, but growing from the leaf axil (the flowers cluster on top of the plant, but also grow out of the leaf axils near the top).
… Christine Hanrahan, 1 December, 2012 - 9:10am login or register to post comments

 
Probably Cecidomyiidi
"Slightly enlarged, reddened flowers" can be produced by at least two species of Cecidomyiidi.
… John F. Carr, 1 December, 2012 - 12:44pm login or register to post comments

 
Possibilities
To me, "slightly enlarged, reddened flowers" sounds like they should be more recognizable as flowers, i.e. differentiated into a normal flower spike as shown here. I think the best match in Gagne's key (1) would be the bud gall of Clinodiplosis lappa, but that's not a perfect match either.
… Charley Eiseman, 1 December, 2012 - 1:35pm login or register to post comments

 
Thank you
Thank you for help with this gall. It seems that it is a bit of mystery at the moment.
… Christine Hanrahan, 1 December, 2012 - 4:43pm login or register to post comments

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