Thanks, M.K!
Yes, it does help: I had looked some more just at some pictures, and made a guess not based on much of anything than that, that it might be Russula.
I have NO previous experience in mushroom ID.
What a great article! Although it makes clear that if it's a Russula, I'm unlikely to find out exactly what it is.
It's OK: my purpose is as part of my permaculture observation. I want to know what's in my yard. And I wanted to understand what kind of mushrooms were hanging out under the 100 year old Pin Oak in NE Ohio. I'm interested in learning more about common pairings of fungi and trees, too.
If it is a Russula, I've learned that they are hard to pin down (pun intended) specifically

Progress!
Thanks again!
Mariamne