noun
a simple slow-growing plant that typically forms a low crusty, leaflike, or branching growth on rocks, walls, and trees.
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Lichen is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi in a mutualistic relationship.
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I found some lichen growing on the rocks near the stream.
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That lichen-covered tree stump looks pretty cool, huh?
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The relationship between the two companies can be compared to lichen, where both parties benefit from their mutual collaboration.