Botanical studies in the Yukon and Northwest Territories carried out in 1972 in connection with Geological Survey of Canada field parties run by Dr. O. Hughes and Dr. N. Rutter
Preface -- What are lichens -- How to make chemical tests -- How to collect and study lichens -- How to use the pictured key -- General references -- Pictured key to the foliose and fruticose lichens -- List of synonyms and incorrect names -- Phylogentic list of genera and families -- Acknowledgments for illustration -- index and pictured glossary.