Lichen

Lichen

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: Lichen (Usnea subfloridana) growing on a branch of a fir tree. This lichen is a good indicator of air quality, as it is intolerant of high sulphur dioxide concentrations. A lichen is a symbiotic organism comprising a fungus and an alga. The alga produces nutrients for the fungus by photosynthesis. Photographed in western Scotland.

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Keywords: air, botany, britain, british, fir tree, lichen, lichens, mutualism, nature, plant, pollution monitor, quality, scotland, scottish, sulfur, sulphur dioxide, symbiosis, symbiotic organism, uk, united kingdom, usnea subfloridana

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