Nature is so rich and we see so little. If I were out collecting mushrooms on my own, there is no way I could hope to find this variety. But 15 sets of eyes, 15 brains, and look what we find in just two hours. And these pictures show just a few samples.
There was so much information to take in, by the time the ID session was 3/4 through, my brain was full. No more please. But there were many more. I learned plenty, but if tomorrow or next week I can identify five or six more mushrooms than I could before I'll have done well.
Not only is the mushroom kingdom remarkably diverse, a good deal of it has hardly been studied. That is a lot to wrap one's brain around.