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I know I don't have all the required information for a proper identification, but guesses would be appreciated. I found this mushroom in my yard in Denver, Colorado. I have no spore print because the cap wasn't opened up yet. The stem was not so brown before I picked it. Smells rather mushroomery. Here is a picture of where it was growing.
The habitat strongly suggests that they are Chlorophyllum molybdites. The very similar looking Chlorophyllum rachodes (=Lepiota rachodes, yes they recently moved it there) only rarely grows in lawns - it is generally found under trees such as Ponderosa Pine.
I agree with ToxicMan... Looks like a Chlorophyllum molybdite to me (aka Green Gills). A spore print should narrow the choices. A C. moybdite will not kill you but from what I hear, will make you wish you were dead (in between the puking and pissing out your bung hole ).