brown mushroom, prominent ring on stem

''Stropharia hornemannii'' is a species of agaric fungus in the family Strophariaceae. It is found in Europe and North America, where it grows as a saprophyte on rotting conifer wood. The specific epithet ''hornemannii'' honors Danish botanist Jens Wilken Hornemann, who made the first scientifically documented collections of the species. Common names for the mushroom include luxuriant ringstalk and lacerated stropharia.