I found this Oak leaf which has a large number of spangle galls on it but I also notice there are a couple of growths on the ribs and I would be interested to know if these are some other form of galls.
Hi Ray - oak must be one of the most 'galled' plants in the UK - mostly caused by gall-wasps. I suspect your galls are the oyster gall, Neuroterus anthracinus, but I can't be absolutely sure. They seem very common in some years, but I didn't think 2018 was a very good year for wasp galls on oak (but this may just be the sites I visit). This is a small, hard gall, identified by flaps of tissue either side, which I can't quite make out in your photo. As far as I know, its always on a vein on the underside. If you're interested in galls, I can thoroughly recommend the FSC guide by Redfern and Shirley (2nd edition) which is one of my most-used ID guides.