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 and medicinal 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), its appearance on hardwoods and its tendency to grow a single clump of dangling spines.Hericium erinaceus can be mistaken for other species of Hericium, which are all popular edibles that grow across the same range. In the wild, these mushrooms are common during late summer and fall on hardwoods, particularly American beech.Main functions of Lions mane mushroom 1.Lion's mane may benefit older adults with mild cognitive impairment, according to a small study published in Phytotherapy Research in 2009. For the study, researchers assigned 30 older adults with mild cognitive impairment to take either lion's mane extract or a placebo every day for 16 weeks. In cognitive tests given at weeks eight, 12, and 16 of the study, members of the lion's mane group showed significantly greater improvements compared to members of the placebo group 2. Hericium erinaceus can nourish organs, and can cure chronic gastricism, duodenum ulcer and other enteron diseases. 3. It also can improve people's immune system. 4. It contain unsaturated fatty acids which is propitious to the circulation of blood and can reduce blood cholesterin content, so Hericium erinaceus is also the ideal food for those who are high blood pressure or with heart or blood vessel disease.