Stropharia ambigua, sometimes called roundhead, is a distinct and showy mushroom. However, because it is so common on the west coast of the United States, residents generally don’t see it as a highly prized specimen as its appearance would indicate.
The pale yellow cap can grow to five inches in diameter. It has a glossy appearance and is sticky. Fragments of broken veil hang down from the edge of the cap, giving them the appearance of icicles with a dusting of snow, and the white scales on the stem complete the illusion of a winter scene.