Mossy bramble gall
Host: Bramble (Rubus sp.).
Gall location: On the leaf.
Description: Small to medium-sized swellings covered in fine, mossy, hairlike projections. Similar in appearance to the mossy rose gall (Diplolepis rosae) which occurs on roses (Rosa arvensis and R. canina).
Range: Thus far reported in Ohio and Pennsylvania.
As with the southern dewberry stem gall, virtually nothing is known of this gall. The inducer is entirely unknown, and there is a chance that the true inducer of this gall is a midge rather than a gall wasp.
”- Louis Nastasi, Charles Davis: (2022) Field Guide to the Herb and Bramble Gall Wasps of North America©