CONTENTS 



Type V 



FACE 



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 



j8. Other Tissues of the Stem ... 48 



2. The Leaf . ... 48 



3. The Root 50 



4. The Growing-Points 



a. The Stem . ... 52 



j3. 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 Protliallus . 61 



B. Development and Structure of the Sexual Organs 



1. The Anther idia . . . . .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) . . .78 

 I. External Characters of the Sporophyte 



A. Vegetative Organs . . . . .80 



B, Reproductive Organs . . . . , 82 



