The images look like a good match. I looked up the gall in a few places and found descriptions of this species that seem somewhat different from all of the images though, so I'm kind of puzzled. Felt 1940 (1) and Weld (2) both describe this species as a cluster of midrib galls with some wool that falls off in the winter. Sounds good so far, assuming there is a cluster of somewhat cylindrical galls under all that wool. The drawings and images show much less wool than these galls have however. There is no mention anywhere of the wool sometimes being red.

Here is a very old description of the gall (genus used to be Dryophanta). The description (and you can find the drawing in this publication if you scroll down to Plate XIII, Figure 10) is consistent with Weld and Felt.

Weld writes that the galls occur on Q. bicolor and macrocarpus. It would be nice to find out if the oak is one of these.

Adults from Andricus ignota emerge in late March and April, according to Weld.

Anyway ... I wish there were better sources of information for eastern oak galls.

Do you think that we should move it back up in case it is something else. Or leave it here and wait for any possible corrections?

I guess if it were me I'd rather err on the side of caution and not have it on a species page until we get more information of some kind confirming the species.

That red color is very distinctive, but it worries me that neither Weld nor Felt mention it, and that their descriptions are of a less woolly gall.

There is so little information out there on many oak galls...

By the way, I've wondered if the red could be caused by a parasitoid. It would be interesting to see if the red wool comes from only some of the galls in the probable cluster along the vein. And then more interesting to rear wasps from individual galls and see if the same things emerge from all of them, or if the color means something about the inhabitants... Lots of questions, very few answers. :(

It was on a Oak leaf. Size: I would say about a 1/2" across and about 1/2" high also.

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April since you and I are in/from NE Ohio maybe you would like to check out www.OhioOdonata.com I am from Garfield Heights, Ohio,currently working in Mosinee, WI. I photographed these galls eggs while out looking for Odonata.

looks like a wooly leaf gall, though I've never seen one this color. I believe the genus of wasp is Andricus