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Usnea is a genus of mostly pale grayish-green fruticose lichens that grow like leafless mini-shrubs or tassels anchored on bark or twigs. The genus is in the Parmeliaceae family.
One of the main active ingredients of usnea is the bitter, yellow, polyphenolic acid called usnic acid (structure diagram, left) that makes up about 1% of the crude material. It is thought to protect the lichen from adverse effects of sunlight exposure and deter grazing animals with its bitter taste.