Abstract
In the region around the Four Corners Power Plant of New Mexico, 159 lichen species in 40 genera are recorded. Although the power plant has operated over 10 years, no marked gradient in species composition or lichen cover data were evident in relation to the power plant. Eight desert lichen species are shown to be sensitive to 0.5 ppm SO/sub 2/ when moist but are insensitive when dry. Because of the aridity of the climate the lichens are probably rarely susceptible to SO/sub 2/ injury. In addition the lack of pattern probably reflects the dominance of resistant crustose growth forms in the lichen flora and the fact that ground level SO/sub 2/ concentrations are relatively low even though SO/sub 2/ emissions are relatively high.
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