I would like to recommend this book on lichen.  I 'met' this book at Eagle
Hill Research Center last summer while taking a class on Lichen with Dr.
David Richardson of St. Mary's University in Nova Scotia.  This is a large
book, 800 pages.  Incredible photographs! Clear text, Excellent
descriptions, current classification, etc. Hardbound:alk. paper.

        Lichen of North America
        by Irwin M. Brodo, Sylvia Duran Sharnoff, Stephen Sharnoff
        Yale University Press, New Haven and London, 2001
        ISBN 0-300-08249-5

Wanda R. Garland