Reishi, also known as Ganoderma lucidum, is a type of mushroom that has been used in traditional medicine for centuries, particularly in Chinese medicine. It is often referred to as the "mushroom of immortality" due to its reputed health benefits, which include boosting the immune system and reducing stress. This mushroom is typically found in tropical and subtropical regions, growing on decaying wood. Reishi can be consumed in various forms, including powders, teas, and capsules. Its distinct reddish-brown color and glossy appearance make it easily recognizable among other fungi.