Oak leaf galls?

Oak leaf galls?

Observation - Oak leaf galls?. Description: Some kind of galls - maybe some kind of spangle-gall but I'm not very sure - on underside of oak leaf. (I'm having a guess at it being the Silk button Spangle gall, because it doesn't look like other types, but I'm really not sure.)

Some kind of galls - maybe some kind of spangle-gall but I'm not very sure - on underside of oak leaf. (I'm having a guess at it being the Silk button Spangle gall, because it doesn't look like other types, but I'm really not sure.)