LICHENS
- an organism that is formed by the symbiotic association of a fungus and an alga or cyanobacterium and occurs as crusty patches or bushy growths on tree trunks, bare ground, etc. Lichens are now classified as a phylum of fungi (Mycophycophyta)
- crustlike plant on rocks, trees, etc.
- LICHEN, to cover with lichens (flowerless plants) [v]
- any of various eruptive disorders of the skin