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Lichens are composite organisms that form when algae or cyanobacteria live in the filaments of fungi in a mutualistic relationship. Lichen, which lack roots, obtain most of their necessary elements from the air; the elemental levels in lichen can reflect the composition of ambient air. As a result, many studies of lichens have emphasized their role as bioindicators of air quality, although not all lichens are equally sensitive to different air pollutants.[1]