A brown branching lichen with stiff spines along the margins of the fronds, growing in mountain and moorland habitats. It can be boiled to produce an edible jelly.
Cetraria islandica, order Parmeliales‘The two lichens of economic importance are Iceland moss, Cetraria islandica, and reindeer moss, Cladonia rangiferina.’
- ‘On our moss-covered trails, mats of shrubby gray reindeer lichen and Iceland lichen are common.’
- ‘In excessive doses or with prolonged use, Iceland moss can cause gastric irritation and liver problems.’
- ‘Since the 17th century, Iceland moss has been known in folk medicine under names such as lung moss or fever moss.’
- ‘Reindeer moss and Iceland moss, both low, branching forms, provide food for large mammals and other animals in northern regions.’