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Hericium erinaceus (also called lion's mane mushroom, mountain-priest mushroom, bearded tooth fungus, and bearded hedgehog) 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 (longer than 1 centimetre or 1⁄2 inch), occurrence on hardwoods, and tendency to grow a single clump of dangling spines. The fruit bodies can be harvested for culinary use.
H. 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 and maple. Usually H. erinaceus is considered saprophytic, as it mostly feeds on dead trees. It can also be found on living trees, so it may be a tree parasite. This could indicate an endophytic habitat.