xii CONTENTS 



CHAPTFR PAGE 



XXIII. Brown Algae (Phaeophyceae) - 37$ 



XXIV. Fungi. Introductory ------- 391 



XXV. Phycomycetes --------- 402 



XXVI. ASCOMYCETES --------- 418 



XXVII. Basidiomycetes -------- 431 



XXVIII. The Bacteria - - - - 448 



XXIX. Introduction to Land-Vegetation - 454 



DIVISION III 



BRYOPHYTA 



XXX. Musci and Hepaticae : Mosses and Liverworts - - 460 

 Appendix on Psilophytales ------ 478 



DIVISION IV 



PTERIDOPHYTA 



XXXI. Filicales. Ferns - - - - - - - -481 



XXXII. Lycopodiales. Club Mosses - - - - - -511 



Appendix on Equisetales. Horsetails - - -522 



DIVISION V 



GYMNOSPERMS 

 XXXIII. Coniferae. The Scots Pine - 



525 



GENERAL CONCLUSION 



XXXIV. Alternation of Generations, and the Land-Habit - 543 



XXXV. Heredity and Variation - - - - - - 557 



XXXVI. The Relation of Size and Form in Plants - - 589 



Appendix A. Types of Floral Construction in Angio- 



sperms - - - -- - - - - -605 



Appendix B. Vegetable Food-Stuffs and Vitamins 653 



Index and Glossary ------- 665 



