Hericium erinaceus (also called lion's mane mushroom, monkey head mushroom, bearded tooth mushroom, satyr's beard, bearded hedgehog mushroom, pom pom mushroom, or bearded tooth fungus) is an edible mushroom belonging to the tooth fungus group. Native to North America, Europe and Asia, it can be identified by its long spines (greater than 1 cm length), occurrence on hardwoods, and tendency to grow a single clump of dangling spines. The fruit bodies can be harvested and used as food. There is no high-quality evidence from clinical research to indicate that lion's mane mushroom has medicinal properties.[1]

Hericium erinaceus can be mistaken for other species of Hericium, which grow across the same range. In the wild, these mushrooms are common during late summer and fall on hardwoods, particularly American beech. Usually H. erinaceus is considered saprophytic, as it mostly feeds on dead trees.[1] However, it can also be found on living trees, so may be a tree parasite as well. This could indicate an endophytic habitat.[1]