the region's macrolichens is intended for use by beginners as well as specialists; weekend naturalists will be able to identify specimens and recognize the great diversity of lichens, while lichenologists and mycologists will gain greater knowledge of the distribution and abundance of various species. The guide includes keys to 92 genera and 458 species of Oregon and Washington macrolichens - all the macrolichens known or expected to occur in the two states. The keys also provide reasonable coverage for lichens of Idaho and Montana, inland to the Continental Divide. Color photographs, illustrations, and full-page detailed descriptions are provided for over 200 species, emphasizing those found in forested ecosystems. The illustrated glossary and introductory material cover the terminology needed to identify macrolichens and provide information on collection and handling. The biology, ecology, and air quality sensitivity of lichens are discussed and regional air quality sensitivities are provided for more than 100 species.

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