Abstract
Algal plasmolysis percentages and other morphological characteristics of Parmelia bolliana Mull. Arg., P. caperata (L.) Ach., P. rudecta Ach., and Physcia millegrana Degel, were compared for specimens growing near to and far from a rural coal-fired generating station in south central Wisconsin. SO2 levels were 389 .mu.g/m3, maximum 1 h level, and 5-9 .mu.g/m3, annual averages. P. bolliana and P. caperata showed evidence of morphological alterations near the station; P. rudecta and Physcia millegrana did not.

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