definition of lichen
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a simple slow-growing plant that typically forms a low crusty, leaflike, or branching growth on rocks, walls, and trees.
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A lichen, or lichenized fungus, is actually two organisms functioning as a single, stable unit. Lichens comprise a fungus living in a symbiotic relationship with an alga or cyanobacterium (or both in some instances). There are about 17,000 species of lichen worldwide.
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