[{"Bold_text": "noun", "List Items": ["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, etc.", "Pathology.any of various eruptive skin diseases."]}, {"Bold_text": "verb (used with object)", "List Items": ["to cover with or as if with lichens."]}]