A lichen (Hypogymnia physodes (L.) Nyl.)

Welcome!

Welcome to the web pages of the USDA Forest Service National Lichens and Air Quality Database and Clearinghouse. Across the US, lichen biomonitoring is helping federal land managers meet federal and agency responsibilities to detect, map, evaluate trends, and assess the ecological impacts of air pollutants. On these pages you can access lichen data from the National Forest system and find out more about lichens and lichen monitoring in general.

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