The Shaggy Parasol is closely related to Chlorophyllym molybdites, a poisonous look-a-like which appears in similar habitats - park lawns, along sidewalks.  Eating this mushroom will likely cause gastrointestinal problems, which while not fatal, will be very unpleasant.  The best way to differentiate this Chlorophyllum molybdites from Chlorophyllum rachodes is to take a spore-print.  The former has a white spore-print, while the latter’s spore-print is green.  In fact, given sufficient time the gills will also turn green.  The other way to tell the difference between them is to see if your specimen bruises reddish before slowly turning brown (C. rachodes). 023-001