They look like sunshine on a log and taste like they were designed by a Michelin chef. But Michigan’s Department of Natural Resources isn’t smiling. Golden oyster mushrooms (Pleurotus citrinopileatus)—a darling of farmers’ markets—have officially landed on the state’s invasive species watchlist. Why? Because if these golden caps bust out of cultivation, they could crash the fungal party in native forests, outcompeting local species and upsetting delicate decomposer networks. In the Grand Cosmic Mycelial Network, balance is everything—and the golden oyster doesn’t always play nice.