Lichen Illustrations
By Alexander Mikulin (mag@proaxis.com)Umbilicaria hyperborea
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United States Forest Service
National Lichens & Air Quality Database and Clearinghouse
- Home
- Database Queries
- Element Analysis Thresholds & Sensitivity Ratings
- Reports, Publications, Protocols
- Lichen Images
- Fun with Lichens and Air Quality: Projects & Ideas
- Links to Other Resources
- Lichens and Air Quality Workgroup
-
Air Program Contacts
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