| Noun | 1. | Stropharia hornemannii - a gilled fungus with a large slimy purple or olive cap; gills become purple with age; the stalk is long and richly decorated with pieces of the white sheath that extends up to a ring agaric - a saprophytic fungus of the order Agaricales having an umbrellalike cap with gills on the underside genus Stropharia, ring-stalked fungus, Stropharia - genus of gill fungi with brown spores that is closely related to Agaricus; here placed in its own family Strophariaceae |