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Lichens are the predominant vegetation in the arctic environment, but the literature on them has remained scattered until now. This is the only detailed lichen guide and key for any region of arctic North America and will be an indispensable reference work for lichenologists, botanists, mycologists, and ecologists alike.

As a working key and manual to the lichen genus Cladonia on the American continent north of Mexico, this study will be a valuable aid to professional lichenologists, botanists, mycologists, plant ecologists, plant ecologists and naturalists.