Return to Lichens and Ecosystems
Return to Lichen Biology and the Environment
Lichen specimens from Alaska's Tongass National Forest. Chemical analysis of lichen tissue reveals pollutants in the air. A baseline air-quality study showed that air in the Tongass was still relatively clean, and the study plots that these specimens came from can be monitored in the future to see what changes have occurred.
Photograph copyright Stephen/Sylvia Sharnoff