Whiskey fungus, also known as Baudoinia compniacensis, is a black fungus that grows in the vicinity of distilleries, spirits maturation facilities, bonded warehouses, and bakeries. It is a sac fungus that colonizes habitats with a preference for airborne alcohol, earning it the nickname whiskey fungus. The fungus feeds on alcohol vapors from barrel-aged whiskey and spreads across any surface it can find. Whiskey fungus is not harmful to human health, but it can be destructive to property and cling to almost any surface, including trees, outdoor furniture, and cars. The fungus can form a black coating layer on tree bark and leaves, but it does not seem to harm the plants by blocking the lenticels or significantly reduce their growth rates. The only way to stop the fungus is to turn off its alcohol supply.