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Title
Multiple species of lichen growing in Alaska #194098735
Description
Multiple species of lichen grow in an alpine field in Alaska. A lichen is a composite organism consisting of a fungus and an alga and/or cyanobacteria growing together in a symbiotic partnership. Lichens are highly sensitive to environmental conditions and are good indicators of environmental change. Lichens are ecologically important as food, shelter, and nesting material for wildlife. The U.S.