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Lichen: Symbiotic Organism on Tree Trunk
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Lichen On Trees
Lichens are composite organisms consisting of a fungus (the mycobiont) and a photosynthetic partner (the photobiont or phycobiont) growing together in a symbiotic relationship. This exuberant one flourishes on a tree trunk in cool, wet weather and shrivels up in the heat. http://en.wikipedia.org/wiki/Lichen #Lichens