Usnea florida lichen

Usnea florida lichen

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Credit: ADRIAN THOMAS/SCIENCE PHOTO LIBRARY

Caption: Usnea florida lichen. Close-up of Usnea florida lichen growing on a tree. A lichen is a symbiotic organism comprising a fungus and an alga. The alga produces nutrients for the fungus by photosynthesis. Usnea florida is found on twigs and branches in the canopy of broad-leaved trees, especially oak. This lichen is a good indicator of air quality, as it is intolerant of high sulphur dioxide concentrations.

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Keywords: air quality, alga, algae, algal, apothecia, apothecium, ascocarp, atmospheric pollution, biodiversity, bioindicator, biological, biology, botanical, botany, clean, close-up, detail, ecological, ecology, environment, environmental, flora, fruticose, fungal, fungus, lichen, lichens, mutualism, mycological, mycology, nature, no one, no-one, nobody, plant, pollution, pure, purity, quality, so2, species, sulphur dioxide, symbiont, symbiosis, symbiotic, unpolluted, usnea florida, wildlife

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