Most likely Panaeolus foenisecii or cinctulus. Spore print to differentiate, Brown including really dark brown for the former, jet black for the latter. P. cinctulus is hallucinogenic.
http://en.wikipedia.org/wiki/Spore_print
By the way, you can add multiple pictures to one spotting, rather than making a loads of spottings for the same type of mushroom.
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