Cetraria Islandica is a type of lichen that is commonly found in Iceland, Greenland, and other regions of the world. It is also known by several other names, including Icelandic moss, feld-moss, Lichen Islandicus, and Cetraria. The lichen has been used for medicinal purposes for centuries and is believed to have anti-inflammatory and antibacterial properties. It is often used as a tea or tincture to treat respiratory illnesses, digestive issues, and skin conditions. Additionally, it is used in the food industry as a thickener or stabilizer. Despite having several names, this type of lichen is highly valued for its health benefits and culinary uses.