CONTENTS 



PAGE 



PREFACE v 



LIST OF ILLUSTRATIONS ix 



INTRODUCTION. By William Trelease I 



FUNGI. By P. A. Saccardo and William Trelease n 



LICHENS. By Clara E. Cummings 65 



ALG^E. By De Alton Saunders 153 



MOSSES. BY J. Cardot and I. The"riot 251 



SPHAGNUMS. By William Trelease 329 



LIVERWORTS (HEPATIC^). By Alexander W. Evans 339 



FERNS AND FERN ALLIES (PTERIDOPHYTES) . By William 



Trelease 373 



INDEX 399 



vii ) 



