Orange crustose lichen grows on the volcanic rock near Lake Mývatn in northern Iceland. Lichens are a symbiosis of a fungus and a green alga and/or cyanobacterium; and crustose is the most common type of lichen in Iceland; accounting for about 400 of the 700 identified species. Crustose are very slow growing; typically growing 1 millimeter or less per year.
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