TABLE OF CONTENTS. 



Preface . 

 Introduction . 



Ill 



3-4 



Part I. The Ophioglossales 



I. The Gametophyte 



Germination in Ophioglossum 



The Adult Gametophyte of Ophioglossum 



The Histology of the Gametophyte . 

 The Gametophyte of So^rjc/jrwrn . 



The Histology of the Gametophyte of Botrychium 

 The Gametophyte of Helminthostachys . 

 The Endophyte ... . . . 



The Sexual Organs ... 



The Antheridium. ... 



The Antheridium of Ophioglossum . 



The Antheridium of fio^f^rcAr'um 



The Antheridium of Helminthostachys 



Spermatogenesis . . . . 



The Archegonium .... 



The Archegonium of 0/>A/o^/ojjum. 



The Archegonium of Botrychium 

 Fertilization . . 



Fertilization in Botrychium virginianum. 

 Significance of the Endophyte 



II. The Embryo .... . . 



The Embryo of Ophioglossum . 



The Development of the Primary Bud in Ophioglossum moluccanum. 



The Embryo of Ophioglossum vulgatum 



The Anatomy of the Young Sporophyte of Ophioglossum . 



T\\e Y.mhxyo oi Botrychium 



The Embryo oi Helminthostachys . .... 



III. The Young Sporophyte 



The Young Sporophyte of Ophioglossum. ,. . . . 



The Young Sporophyte of Botrychium 



The Young Sporophyte of //£'/m!«*/ioj/af/!yj. 



Comparison of the Young Sporophytes of the Ophioglossacea; 



IV. The Adult Sporophyte . 



The Sporophyte of Ophioglossum 



The Anatomy of Euophioglossum 



The Root in Euophioglossum . 



Anatomy of Ophioderma 



Anatomy of Cheiroglossa. 

 The Sporophyte of 5o?ryc/!!um 

 The Sporophyte of Helminthostachys 

 The Sporangiophore of the Ophioglossales 



The Development of the Sporangiophore 



The Development of the Sporangium . 



