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Panaeolus foenisecii
light brown, 3" tall
woodchips
I spotted huge clumps of these growing in the woodchips under a japanese maple behind our workshop near the Floral Showhouse. Not sure about the species suggestion but believe the genus is correct.
@Darwinist - These mushrooms sprouted up again at my work. They changed color over a few days but were definitely very dark like the link in your suggestion. I've updated it now without a doubt.
I'm not sure about your suggestion. I believe it is probably a species of Panaeolus but P. foenisecii appears to be much darker and usually found in lawns.