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 CHAPTER XL. FOLIAGE LEAVES. 383 I. General Form and Arrangement of Leaves. 383 II. Protective Modifications of Leaves. 392 III. Protective Positions. 395 IV. Relation of Leaves to Light. 397 V. Leaf Patterns. 404 CHAPTER XLI. THE ROOT. 410 I. Function of Roots. 410 II. Kinds of Roots. 415