Stropharia rugosoannulata, the Wine-cap or King Stropharia, is often cultivated but also grows wild in disturbed soils or wood chips. The dry, wine- colored cap soon fades toward tan. Gills are whitish in youth but darken to the spore color: purple-black. A thick, radially grooved and split partial veil rings the sturdy white stalk. When young, this species is a choice edible with a flavor resembling asparagus. Take care not to confuse it with other dark-spored species; some of them are poisonous.

Thanks to Mike Hopping for the photo and description.