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