Lichen sclerosus is an uncommon, long-term skin condition where small patches of skin become thin and colorless. The condition can affect any part of the body but most often occurs in the skin around ...

- lichen with branched flattened partly erect thallus that grows in mountainous and Arctic regions; used as a medicine or food for humans and livestock; a source of glycerol ...

- an erect greyish branching lichen of Arctic and even some north temperate regions constituting the chief food for reindeer and caribou and sometimes being eaten by humans ...