Nice specimens! I am lucky to have my own, unknown of little patch at a park. It sits low, and borders a swampy area, so it's always damp. The season is short for them there, but I've always been pleased with them! I need to nail down some other spots so I can have more.
Poly-trip,
Yes they vary GREATLY, from one strain to the next. In my little patch, there's the classic bell shape, all the way to flat top, saucer shapes, and even curling edges. Luckily I have quite a bit of experience with these little guys, a newbie would probably not even recognize most of them. There's even some albino ones that turn blue, since they are without pimnent. Libs usually don't turn blue.
The strangest one I have found was a strain quite comparable to penis envy. Think of a penis envy liberty cap for a moment. It's pretty strange, with a fat stem and little bitty cap. I'll post a picture of it.