Life on the Rocks
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Scan day: 17 February 2014 UTC
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Description: A peep into the world of lichens by Paul James with photographs of a number of species growing in Wales.
Life on the rocks. A peep at the world of lichens. are certainly fascinating forms of life. I think most of us have seen the forms that live on rock surfaces, especially in areas where the climate is damp. Some are very durable, having the ability to resist considerable variations of temperature and moisture conditions etc. Yet they are sensitive to the vagaries of air pollution, and in particular sulphur dioxide. Their presence therefore usually indicates clean air, though some are more tolerant than others.
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