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Photo#443421
Goldenrod gall - Procecidochares atra

Goldenrod gall - Procecidochares atra
Horsham trail. Horsham, Montgomery County, Pennsylvania, USA
August 13, 2010
Size: ~ 2.5 mm
This seems to be a different kind of goldenrod bunch gall. There were clusters of smallish galls (about 1 cm each) along a stem, near the tip. The other bunch galls are larger and looser. There was only one chamber in the center of the gall and each had only one larva, which I assume is a Cecidomyiid. The inside of the other bunch galls is quite different.
I found only one plant with this type of galls. I hope that I can raise some.

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Goldenrod gall - Procecidochares atra Goldenrod gall - Procecidochares atra Goldenrod gall - Procecidochares atra Goldenrod gall - Procecidochares atra

Moved
Moved from ID Request.

Indeed, this is Procecidochar
Indeed, this is Procecidochares atra. Its galls are most common on S. altissima, S. gigantea, S. rugosa.
The species has two generations a year and these are the summer generation galls. Interestingly, the spring generation develops in large stem galls at the base of the host plant and each gall contains several larvae, unlike the pictured bud galls of the summer generation, each of which contains a single larva.

Procecidochares?
Following up on my comment here...
This larva reminds me of the fat, juicy tephritid larva at the center of a goldenrod ball gall, rather than a cecidomyiid. I just determined that Oedaspis polita and O. atra, mentioned by Felt (1) as making rosette galls on Solidago altissima, are now placed in the genus Procecidochares, so I'm betting that's what this is.

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