Lichen is a composite organism that is made up of both a FUNGUS and an alga. The crossword solutions for the term lichen include MOSS (4 letters), oakmoss (7 letters), LITMUS (6 letters), FUNGUS (6 letters), parelle (7 letters), and epiphyte (8 letters). MOSS is a small, soft plant that grows in clumps or mats in damp or shady locations. Oakmoss is a type of lichen that grows on oak trees. LITMUS is a dye derived from certain lichens that is used to test the acidity of a solution. FUNGUS is a group of organisms that includes mushrooms, molds, and yeasts. Parelle is a type of lichen that grows on rocks. Epiphyte is a plant that grows on another plant but does not take nutrients from it.