Club moss is a common name for various species of Lycopodium, a type of spore-bearing plant found in temperate and tropical regions around the world. Some synonyms for club moss include ground pine, running pine, princess pine, and wolf's claw. Other names include creepers, truffles, and shoebutton ferns. In traditional medicine, club moss has been used to treat respiratory ailments, skin conditions, and urinary tract infections. The plants are also used in horticulture as ground cover or as decorative accents. However, some species of Lycopodium are considered invasive and can harm native ecosystems.