Lichen Iceland
Lichens are composite organisms consisting of a symbiotic association of a fungus (the mycobiont) with a photosynthetic partner (the photobiont or phycobiont), usually either a green alga (commonly Trebouxia) or cyanobacterium (commonly Nostoc). The morphology, physiology and biochemistry of lichens are very different to that of the isolated fungus and alga in culture. Lichens occur in some of the most extreme environments on Earth—arctic tundra, hot deserts, rocky coasts and toxic slag heaps. However, they are also abundant as epiphytes on leaves and branches in rain forests and temperate woodland, on bare rock, including walls and gravestones and on exposed soil surfaces ( Collema) in otherwise mesic habitats. Lichens are widespread and long-lived; however, many species are also vulnerable to environmental disturbance, and may be useful to scientists in assessing the effects of air pollution, ozone depletion, and metal contamination. Lichens have also been used in making dyes and perfumes, as well as in traditional medicines.
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Photo credit: © Phil Degginger / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: botany, composite, epiphytes, foliose, form, geology, iceland, landmannalaugar, lichen, life, organisms, photobiont, photosynthetic, phycobiont, plant, primitive, relationship, symbiotic
