This book describes and illustrates the 760 species of mosses currently known to occur in the British Isles and incorporates the most up-to-date information available on classification and nomenclature, including recent synonyms. The descriptions provide information on frequency, ecology, geographical relationships and distribution, including information on protected species and those species at risk. This second edition incorporates the very considerable advances in our knowledge of mosses made over the last quarter of the twentieth century and will provide a unique resource for all concerned with these fascinating organisms. First Edition Hb (1978): 0-521-21648-6 First Edition Pb (1980): 0-521-29973-X