Genus Evernia, commonly known as Oakmoss, is a type of lichen that has been used in perfumery for its earthy and woody scent. Some common synonyms for the term Genus Evernia include Evernia prunastri, Lichen prunastri, Oaklife, and Tree Moss. Other synonyms include Achroa, Bryoria, Flavoparmelia, Pseudovernia, and Platismatia. These synonyms all refer to different species within the Genus Evernia and have different characteristics and scents. Oakmoss is a valuable ingredient in perfumes and is often used as a base note in many fragrances due to its long-lasting scent and fixative properties.