Define lichen?


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Define Lichen (noun): any complex organism of the group Lichenes, composed of a fungus in symbiotic union with an alga and having a greenish, gray, yellow, brown, or blackish thallus that grows in leaflike, crustlike, or branching forms on rocks, trees.

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Lichen: A fungus that grows a symbiotic relationship with algae. Thanks for asking ChaCha!

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