Lichen Biology by Thomas Nash
Lichens provide the best known example of symbiosis, combining fungi and algae in an intimate biological union. This up-to-date account spans their anatomical, morphological, physiological and ecological aspects and provides a modern overview of lichen biogeography and systematics.
Cambridge University Press: 1996.
ISBN: 9780521459747. 303 pp.
Softcover. Very good.