Leucoagaricus leucothites, commonly known as the smooth parasol, woman on motorcycle,[1] ma'am on motorcycle,[2] white dapperling, or white agaricus mushroom, is a species of agaric fungus. The species was originally described as Agaricus leucothites by Carlo Vittadini in 1835, and bears similarity to species of that genus.[3] Solomon Wasser transferred it to Leucoagaricus in 1977. While sometimes regarded as edible,[4] the species is suspected of being poisonous due to gastric-upset-causing toxins.[5] It could also be confused with the deadly Amanita ocreata.
The mushroom's cap is 4 to 15 cm wide, is granular, white or gray-brown in color then sometimes grayish or pinkish. The flesh may bruise yellowish and the gills reddish. The stipe is 5 to 12 cm long, commonly with a wide base, and bruising yellow or brown. A ring is usually present. The spores are white, smooth, and elliptical.
It generally appears in civilized areas such as gardens and parks, but sometimes is found in forests.