Seashore lichens

Seashore lichens

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Caption: Seashore lichens. Ochrolechia parella (grey) and Caloplaca verruculifera (orange) lichens growing on a rock. A lichen is a mutualistic organism comprising an alga and a fungus that live in a mutually-beneficial relationship. The alga produces carbohydrates for the fungus by photosynthesis, and the fungus protects the alga from harsh conditions. Lichens are highly sensitive to pollution: several are used as indicator species for sulphur dioxide levels in the atmosphere. Photographed at Cardigan Bay, Wales.

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Keywords: alga, algal, botany, britain, british, caloplaca verruculifera, cardigan bay, coastal, cwm tydu, fungal, fungus, lichen, lichens, mutualism, mutualist, mutualistic, nature, ochrolechia parella, plant, rock, seashore, surface, symbiont, symbiosis, symbiotic, thalli, thallus, uk, united kingdom, wales, welsh

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