Gray Reindeer Lichen

Cladonia rangiferina

''Cladonia rangiferina'', also known as reindeer lichen , lat., is a light-colored, fruticose lichen belonging to the Cladoniaceae family. 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, but these names may be misleading since it is not a moss. As the common names suggest, reindeer lichen is an important food for reindeer , and has economic importance as a result. Synonyms include ''Cladina rangiferina'' and ''Lichen rangiferinus''.

Reindeer lichen, like many lichens, is slow growing and may take decades to return once overgrazed, burned, trampled, or otherwise consumed.

A similar-looking species also known by the common name Reindeer lichen is ''Cladonia portentosa''.
Lichen of the slowest pace [HDR] My first go at HDR: 3 pictures shot at 100ISO and long exposure times, plus and minus 2 EV, 13sec, 2.5sec,30sec). It's reindeer lichen, a very slow growing lichen eaten by mainly Reindeer/Caribou.

This lichen I found while hiking up in Norway with my wife. It is highly protected and it is absolutely forbidden to break off. This loose piece photographed here I found on the ground in a swamp, it was partially eaten. I did not have to break it off, only pick it up, so I was kinda in the clear. 
I did not know the reason for it having such a protected state. Years later I read about their very very slow growth rate. 
Reindeer lichen is slow growing (only 3–5 mm per year) and may take decades to return once overgrazed, burned, trampled, or otherwise consumed. This piece is about 4cm in radius, so about 10 years old. I did not know that..

This piece is about 10 years in my possession now, residing in one of our book shelves. It is battered a bit, discoloured too. I'll have to make due.  Cladonia rangiferina,Geotagged,HDR,Norway,macro,reindeer lichen,soligor 36mm

Appearance

Thalli are fructicose, and extensively branched, with each branch usually dividing into three or four ; the thicker branches are typically 1–1.5 mm in diameter. The color is grayish, whitish or brownish grey. ''C. rangiferina'' forms extensive mats up to 10 cm tall. The branching is at a smaller angle than that of ''Cladonia portentosa''. It lacks a well-defined cortex , but rather, a loose layer of hyphae cover the photobionts. The photobiont associated with the reindeer lichen is ''Trebouxia irregularis''.
It grows on humus, or on soil over rock. it also grows mostly in taiga and the tundra.
A trekkies dream: the mutual symbiant In the northern regions, like Norway, this reindeer lichen is the main source of food for wild reindeer. It is a protected lichen and forbidden to pick or take home for us humans. It grows with a rate of only 3 to 5 mm each year. First I did not understand why it had to be protected, but now I understand: when trampled or picked it will takes 10s and 10s of years for it to reach adulthood again.. 
The interesting part is that it is not a 'single entity' but a combination. It is a mutual of a type of fungus and an algae: the combination is called 'thallus'. Cladonia rangiferina,Geotagged,Norway,algae,lichen,protected,symbiant

Status

''Cladonia rangiferina'' often dominates the ground in boreal pine forests and open, low-alpine sites in a wide range of habitats, from humid, open forests, rocks and heaths. A specific biome in which this lichen is represented is the Boreal forests of Canada.

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

Habitat

''Cladonia rangiferina'' often dominates the ground in boreal pine forests and open, low-alpine sites in a wide range of habitats, from humid, open forests, rocks and heaths. A specific biome in which this lichen is represented is the Boreal forests of Canada.

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

Uses

This lichen can be used in the making of aquavit, and is sometimes used as decoration in glass windows. The lichen is used as a traditional remedy for removal of kidney stones by the Monpa in the alpine regions of the West Kameng district of Eastern Himalaya. The Inland Dena'ina used reindeer lichen for food by crushing 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 present in lichens, their consumption may cause an upset stomach, especially if not well cooked.

A study released in May 2011 claims that some species of Lichens including the Cladonia Rangiferina are able to degrade the deadly prion through the enzyme serine protease.

References:

Some text fragments are auto parsed from Wikipedia.

Taxonomy
KingdomFungi
DivisionAscomycota
ClassLecanoromycetes
OrderLecanorales
FamilyCladoniaceae
GenusCladonia
SpeciesC. rangiferina
Photographed in
Norway