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Library of Congress
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lichen
li·chen [ lkən ]


noun 
Definition:
 
organism growing on rocks: a complex organism consisting of fungi and algae growing together in symbiosis that often appears as gray, green, or yellow patches on rocks, trees, and other surfaces
[Early 17th century. Via Latin< Greek leikhēn]

li·chened adjective
li·chen·i·form [ lī kénni fàwrm, lkəni fàwrm ] adjective
li·chen·oid [ lkə nòyd ] adjective
li·chen·ous adjective
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