CONTENTS 



PAGE 



PREFACE v 



LIST OF ILLUSTRATIONS 1X 



INTRODUCTION. By William Trelease I 



P^UNGI. By P. A. Saccardo and William Trelease 11 



LICHENS. By Clara E. Cummings 65 



ALG^E. By De Alton Saunders 153 



MOSSES. BY J. Cardot and I. Theriot 251 



SPHAGNUMS. By William Trelease 329 



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



FERNS AND FERN ALLIES (PTERIDOPHYTES). By William 



Trelease 373 



INDEX 399 



62/31 



