Lichen Sensitivity and Frequency Data

Lichens were collected from plots during air quality monitoring surveys on selected National Forests of Region 6 from 1994 to the present. Epiphytic macrolichens were collected comprehensively on a 114' circular plot overlaid on point 1 of the Current Vegetation Survey plot. Other lichens (crusts, macrolichens on soil and rock) were collected sporadically. Lichen sensitivity and frequency of occurrence within each Forest are presented below. Sensitivity is as determined by McCune and Geiser (1997), using field based, lichen community studies in western Washington and Oregon. Frequency of occurrence is calculated as the percent of plots sampled in which the species was found to occur (on that Forest). Number of plots sampled is listed for each Forest.