Definition of lichenCategorized under "General"
Definition as written by GrannyLois:
Any of numerous complex thallophytic plants made up of an alga and a fungus growing in symbiotic association on a solid surface (as a rock).
Definition as written by Magpye:
A combined growing condition of algae and fungus. It looks crusty, and comes in many colors: gray, green, bluish, or browns.
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