I think it's a toadstool. At least thats what I call it. Found it in my garden two or three years ago in the fall.
Wow! Never saw one like that!
I'm sure one of these regulars here will be able to name it.
Not me though. I found a neat site with 476 toadstool images, if anyone's interested in browsing.
(I REALLY need to get going and clean my house!)
Here is a link that might be useful: Toadstool images
Wow, almost looks like a turtle!