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Henderson-Sellers, A/ Seaward, MRD 1979: Monitoring lichen reinvasion of ameliorating environments. - Environmental Pollution 19: 207-213. [RLL List # 104-47 / Rec.# 8246]
Abstract: 1 table. 6 figures. [Lecanora muralis monitored in West Yorkshire. "The results indicate that the response to improved atmospheric conditions is slow and difficult to model in terms of a simple threshold value of sulphur dioxide alone. It appears that the lichen's response becomes dependent upon other parameters as the atmospheric pollutant levels drop."]

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