Agaricus braendlei

About

Agaricus braendlei is a species of mushroom in the family Agaricaceae. It is found in North America, and closely related to A. campestris. Both species are popular edibles characterized by white, slightly furry caps, bright pink gills which turn to chocolate brown as the spore mature, and no staining reaction when bruised or scratched. Like most Agaricus species, this species has a ring on the stalk and no volva.

Summary from Wikipedia