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Macrolepiota procera
Looks more like the shaggy parasol - I have a clump of them in my yard. Similar climate and time of year for us to have them. I harvest them whenever they come up. The key is the dark button stage, and the reddish cut surfaces.
Fairy cap type mushroom.
Check No 12 what is look similar to your spotting...
http://www.nerdygaga.com/3512/mushroom-t...