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Chlorophyllum molybdites
White toastool fungi
Grass
As a lawn mushroom, there really isn't anything that looks close to C. molybdites. The regular parasol mushroom, maybe, but that's in a different habitat. The ones you've found occur in an urban setting, get their energy from grass and grass clippings, and if you look under the hood, the gills should be green. That's your classic poisonous neighborhood green-spored parasol. :)
Compare with a pair I shot in Glendale: http://www.projectnoah.org/spottings/739...