This is a Agaricus placomyces member of the mushroom family. Its one of the more common mushrooms that grow on American lawns. I wouldnt recommend eating it, as its been known to cause gastrointestinal symptoms (diarehha, gas, stomach pain), but its not like it will kill you. If you cook and clean it well enough, you shouldnt experience any adverse symptoms. Its not a hallucinogen if thats what you're thinking. Its not gunna get you high.