That's the top of one. It's a smaller one, probably about 3-4" across. Some are more like 5-6".
That's the bottom and stem of him. He just opened up this morning, he starts with a very white stalk and his top curled around like a ball. As they age the stalk gets more brown, and the stalk is pretty woody. The ring does not move, it's firmly attached.
I was toying with the idea of him being a Parasol or Lepiota Procera. But I'm not happy with his spore print so far.
This new guy sat on a white piece of paper all night, but I got nothing. I don't think it was white because the paper doesn't feel like anything was deposited on it. Maybe I shouldn't have left it outside all night.
I have some older guys like him - I picked them two days ago and did some spore prints that day. But I admit, it rained a lot the day before picking and they were a bit soggy. I thought maybe they were molding in their gills. Or maybe part of the identification is going green in the gill as it gets older.
That's the bottom and top of one of the guys I picked when it was soggy and turning greenish underneath. The green isn't visible in the picture - I don't know if it seeped in or all fell off or what.
The spore prints for these ones that were sitting there in the ground perhaps 3-4 days since they opened up flat - turned out green.
So, looking at my National Audubon Society Field Guide to Mushrooms, I wouldn't think these are Lepiota Procera, but perhaps the Green-Spored Lepiota. But I don't like the picture of the green spored from my book so much, as in it's youth the top is smooth white and mine are not. Also, mine have more "scales", "bumps" whatever you want to call them, looking more like the procera.