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Dry, smooth, white-capped mushroom with pink free gills and a white stipe with a thin annulus. Younger mushroom still with partial veil in tact. Spore print a dark chocolate brown. Macroscopically, Agaricus andrewii is nearly indiscernable from Agaricus campestris (Meadow mushroom), but it usually has a much smoother and whiter cap than the latter. Both are choice edible mushrooms.
Growing gregariously on a mown grassy lawn in full sun (at a public park).
I am still open to debate about the ID of this mushroom. I may have to break out a microscope to confirm that it is A. andrewii rather than A. campestris!