Orange lichen on a rock at Gruissan, Languedoc-Roussillon, France. A lichen is a composite organism that arises from algae or cyanobacteria (or both) living among filaments of a fungus in a mutually beneficial relationship (symbiotoc relationship). The whole combined life form has properties that are very different from properties of its component organisms. Lichens come in many colors, sizes, and forms. The properties are sometimes plant-like, but lichens are not plants.
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