Family Hydnaceae is a group of fungi that includes species commonly known as tooth fungi or hedgehog mushrooms. These fungi have a unique appearance, with spiny projections on their undersides that resemble teeth or spines. There are several synonyms for Family Hydnaceae, including Hydnum, Dentinum, and Hericium. Hydnum is the most frequently used synonym, and it is often used to refer to the entire family, as well as to individual species within the family. Dentinum is a lesser-known synonym that is sometimes used to refer to specific types of tooth fungi, while Hericium is used to describe a closely related family that includes the popular edible mushroom known as Lion's Mane.