CONTENTS 



Type V 



PAGE 



THE MALE FERN (Aspidium Filix-Mas) . , , ,37 



I. External Characters 



A. Vegetative Organs . . , . 38 



B. Reproductive Organs ..... 42 



II. Internal Structure of the Sporophyte 



A. The Vegetative Organs 



1. The Stem 



a. The Vascular System . . ,44 



0. Other Tissues of the Stem . . .48 



2. The Leaf . ... 48 



3. The Root ...... 50 



4. The Growing-Points 



a. The Stem . ... 52 



,8. The Root ..... 53 



7. The Leaf ..... 55 



B. Reproductive Organs of the Sporophyte . . 55 



III. The Oophyte or Sexual Generation 



A, Development and Structure of the Prothallus . 61 



B Development and Structure of the Sexual Organs 



1. The Antheridia . . . . .65 



2. The Archegonia ..... 67 



C. Fertilisation ...... 69 



D. Embryology ...... 71 



E. Comparison between the Life-History of Ferns and 



that of the Higher Plants . . .73 



Type VI 



THE FIELD HORSETAIL (Equisetum arvense) . . .73 



I. External Characters of the Sporophyte 



A. Vegetative Organs ... 80 



B. Reproductive Organs ..... 82 



