Rock Mushrooms, also known as Petri Fungus, are objects from The Legend of Zelda: Oracle of Seasons. These large mushrooms are petrified during all seasons but autumn, when they can be picked. Until Link has unlocked the Spirit of Autumn's power, these mushrooms serve as obstacles, blocking Link's way. Once picked up with the Power Bracelet, Rock Mushrooms can be thrown away again, only to dissolve. They can also be destroyed with the Magical Boomerang.