Usnea (Usnea barbata) is a fruticose lichen belonging to the family Parmeliaceae. It grows all over the world and is commonly called old man’s beard, beard lichen, or beard moss. It contains chemicals that may fight germs that might cause infections as well as decrease swelling, pain and fever. Usnea also contains usnic acid and polyphenols which may offer a range of health benefits such as weight loss, pain relief and cancer protection.