Lichen

Cross with lichen on stone, at Hermitage St Helier, Jersey
Lichen-covered tree, Isles of Scilly, UK. Grey, leafy lichen upper half of trunk; yellowy-green lichen on middle, lower half and up the extreme right side; and a shrubby lichen
A foliate (leafy) lichen on a branch with dark green mosses

Lichens are a symbiosis of at least two quite different organisms. The partnership always involves a fungus, which lives with one or more partners which can do photosynthesis. The photobiont[1] partner may be a green alga and/or a cyanobacterium.[2]p5,6,13

The algae or bacteria live inside the fungus, and exchange nutrients with it. The lichen is different in shape and mode of life from any of the partners. It is a distinct form of life. Botanists did not know this until about 1875.[3]

There are more than 2,000 species in Britain and Ireland alone, many of which are found in temperate rainforests.[4]

  1. photosynthesis+bio = photobiont
  2. Cite error: The named reference Purvis was used but no text was provided for refs named (see the help page).
  3. de Bary, Anton 1879. Die Erscheinung der Symbiosis. In Verlag auf der Versammlung der Naturforscher und Artze zu Cassel. Strassburg.
  4. Rescue mission for UK rainforests’ weird treasures [1]

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