CHAPTER XXV.. Mosses (musci). 243

MOSSES (Musci). 243 Classification of Mosses. 248

CHAPTER XXVI. FERNS. 251

CHAPTER XXVII. FERNS CONTINUED. 262 Gametophyte of Ferns. 262 Sporophyte. 268

CHAPTER XXVIII. DIMORPHISM OF FERNS. 273

CHAPTER XXIX. HORSETAILS. 280

CHAPTER XXX. CLUB MOSSES. 284

CHAPTER XXXI. QUILLWORTS (Isoetes). 289

CHAPTER XXXII. COMPARISON OF FERNS AND THEIR RELATIVES. 292 Classification of the Pteridophytes. 295

CHAPTER XXXIII. GYMNOSPERMS. 297

CHAPTER XXXIV. FURTHER STUDIES ON GYMNOSPERMS. 311

CHAPTER XXXV. MORPHOLOGY OF THE ANGIOSPERMS: TRILLIUM; DENTARIA. 318

CHAPTER XXXVI. GAMETOPHYTE AND SPOROPHYTE OF ANGIOSPERMS. 325

CHAPTER XXXVII. MORPHOLOGY OF THE NUCLEUS AND SIGNIFICANCE OF GAMETOPHYTE AND SPOROPHYTE. 340

PART III. PLANT MEMBERS IN RELATION TO ENVIRONMENT.

CHAPTER XXXVIII. THE ORGANIZATION OF THE PLANT. 349 I. Organization of Plant Members. 349 II. Organization of Plant Tissues. 356

CHAPTER XXXIX. THE DIFFERENT TYPES OF STEMS. 365 I. Erect Stems. 365 II. Creeping, Climbing, and Floating Stems. 369 III. Specialized Shoots and Shoots for Storage of Food. 372 IV. Annual Growth and Winter Protection of Shoots and Buds. 374