The Acid Mushroom is a hazardous species of flora. It is used as a raw material to manufacture Batteries. The player can pick them by hand. The player can also strike one with a knife to destroy it and collect four Acid Mushroom Spores, which releases acid into the water that can cause damage to the player, structures and nearby fauna and flora. The Acid Mushroom and its spores can be planted in an Exterior Growbed or an Alien Containment.