I have no idea what this clitocyboid species is; I am pretty sure it is not a Clitocybe, but that is all. Added in response to CureCat: Sorry that I misidentified where it is from before (I had forgotten); I changed it now. It was on the indentification table at our Wisconsin Mycological Society foray. I saw it in Hiles, and it was probably picked in Forest County, but people went to several sites. As you figured out, it was not from the grass that I took the picture on, and you can see some very decayed wood in the photo taken from the top. I agree that it might be some sort of a Panus species.