Agaricus? View of cap underside and ring.

Mushrooms scattered on a well-watered lawn on Crown St and New York Ave in Brooklyn. These things popping out of a postage stamped sized lawn that curiously had fly agaric lawn adornments. cute! my guess is some kinda agaricus, purple-brown spores, more are popping out so I'll check on it tomorrow.. White gills, pale-yellow cap, thick stem, a little bit of a bulbous bottom, pleasant mild smell.