lichen

A symbiotic relationship of a fungus and alga living together. They live in a thallus. The alga supplies the food for the fungus and thallus, while the fungus provides protection from the sun for the alga and produces a substrate that accelerates photosynthesis. Rheindeer moss is a lichen.

A crustose lichen growing on rock.	A foliose lichen are common growing on the bark of trees.
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