Fjallagrös

Cetraria islandica, also known as true Iceland lichen or Iceland moss, is an Arctic-alpine lichen whose erect or upright, leaflike habit gives it the appearance of a moss, where its name likely comes from. It is often of a pale chestnut color, but varies considerably, being sometimes almost entirely grayish-white; and grows to a height of from 7.6 to 10.2 centimetres , the branches being channelled or rolled into tubes, which end in flattened lobes with fringed edges.

Source: Wikipedia