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943During the winter our environment group continued our biodiversity studies with a detailed investigation of lichens as indicators of environmental pollution. We were fortunate in one of our members, Peter Swire, being an enthusiastic and knowledgeable member of the British Lichen Society. Following a detailed look at the nature, characteristics and life cycle of lichens, species gathered in the field were first of all identified and then grouped according to their ability to tolerate sulphur dioxide pollution.