Found in Eastern Ohio. Not sure what type of tree it is, but there's lots of maple, oak, and black walnut around. There's also something dropping a cherry-like fruit (chokecherry?).
Here's a picture of the underside:
Edit: it wouldn't let me post the other picture, so I'll try doing it in a comment
Thanks for the info. I'm beginnng to realize how difficult this stuff can get, haha! Not sure how to tell if an annulus is wooly or a pileus is scaly. Looking at the pictures, A. gallica actually does look like the ones I saw. Idk though, maybe if I had a microscope and some more experience, I'd be able to tell better.
Anyway, thanks again for all your help! I've been learning a lot through this stuff.