Freedom from a fairy ring often requires outside intervention. European superstitions routinely warned against entering a fairy ring. There are about 60 mushroom species which can grow in the fairy ring pattern. There are two generally recognised types of fairy ring fungus. The man destroyed a nest of rooks in a tree surrounded by a fairy ring. They danced and enjoyed themselves, leaving circles (like Fairy Ring) in the grass. The only way to enter Toad Hollow is a gateway known as the Fairy Ring. Several of the species are known to grow in the characteristic fairy ring pattern. The first follows the Toadlets as they find the Fairy Ring. It is thought to be the largest known fairy ring. The mass of hyphae is sometimes called shiro, especially within the fairy ring fungi. He tells them about the Fairy Ring and how to find it. Destroying a fairy ring is unlucky and fruitless; superstition says it will just grow back. One states that the fairy ring is begun by a spore from the sporocarpus. This ring of trees is called a "fairy ring".