A large, common lawn mushroom often mistaken for edible parasols. Its broad cap is whitish with brown scales, flattening with age, and its tall stem bears a movable ring. The gills are first white, then turn green as the spores mature—a key identifying feature. Found in lawns, fields, and open areas, especially after summer rains. It is highly poisonous, causing severe gastrointestinal distress, and should never be eaten.