here. I have come across a lot of others since then, and decided it's time for part 2. Some of these I pulled from other misc. posts, but the majority are new. I'm no authority on galls, and references are not easy to come by. I always welcome an expert to correct anything I post, but there aren't a lot of people who work on them.
These spotted little cherries look like the Banded Bullet Gall, created by Dryocosmus imbricariae, a tiny wasp. This was found on Black Oak, but they attack other species, especially Shingle Oak. Some of the common names in this post I simply made up because they often don't have one.
This week I had students open one up. They found Ants on the inside feeding off the Aphids.