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Cladonia rangiferina
Scientific classification
Kingdom: Fungi Division: Ascomycota Class: Lecanoromycetes Order: Lecanorales Family: Cladoniaceae Genus: Cladonia Species: C. rangiferina
Binomial name
Cladonia rangiferina

Cladonia rangiferina, also known as Reindeer lichen (c.p. Sw. renlav), lat., is a light-colored, fruticose lichen belonging to the family Cladoniaceae. It grows in both hot and cold climates in well-drained, open environments. Found primarily in areas of alpine tundra, it is extremely cold-hardy.

Other common names include Reindeer moss and Caribou moss. As the common names suggest, Reindeer lichen is important food for reindeer (caribou), and has economic importance as fodder for reindeer.

This lichen can be used in the making of aquavit, and is sometimes used as decoration in glass windows. The Inland Dena'ina used reindeer lichen for food by smashing the dry plant and then boiling it or soaking it in hot water until it becomes soft. They eat it plain or, preferably, mixed with berries, fish eggs, or lard. The Inland Dena'ina also boil Reindeer lichen and drink the juice as a medicine for diarrhea. Due to acids in the plants, lichens may cause an upset stomach, especially if not well cooked.

Reindeer lichen, like many lichens, is slow growing (3-5 mm per year) and may take decades to return once overgrazed, burned, trampled, or otherwise consumed.[1]

A similar-looking species also known by the common name Reindeer lichen is Cladonia portentosa.

C. rangiferina forms extensive mats up to 8cm tall. It is richly branched, each branch usually dividing into four, with the main branches markedly curved in the same direction. The branching is at a smaller angle than that of Cladonia portentosa.^[1]

In certain parts of its range this lichen is a threatened species. For example in the English county of Cornwall it is protected under the UK Biodiversity Action Plan.