| Noun | 1. | Stropharia rugoso-annulata - a large gilled fungus with a broad cap and a long stalk; the cap is dark brown; the white gills turn dark purplish brown with age; edible and choice 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 |