TABLE OF CONTENTS. 



Preface iij 



Introduction 3-4 



Part I. The Ophioglossales 



1. The Gametophyte 6-35 



Germination in Ophioglossum 7 



The Adult Gametophyte of Ophioglossum ............ 10 



The Histology of the Gametophyte 15 



The Gametophyte of Botryc hium 16 



The Histology of the Gametophyte of Botryckium 18 



The Gametophyte of Helminthostachys in 



The Endophyte 21 



The Sexual Organs 22 



The Antheridium .............. 22 



The Antheridium of Ophioglossum 22 



The Antheridium of Botryc hium 24 



The Antheridium of Helminthostachys 25 



Spermatogenesis 26 



The Archegonium 28 



The Archegonium of Ophioglossum. . 28 



The Archegonium of Botrychium ?o 



Fertilization ?r 



Fertilization in Botryckium virgtntanum. .......... 11 



Significance of the Endophyte ?2 



II. Tin Embryo ... 54-54 



The Embryo of Ophioglossum ^4 



The Development of the Primary Bud in Ophioglossum moluccanum 40 



1 he Embryo of Ophioglossum vulgatum ............ 45 



The Anatomy of the Young Sporophyte of Ophioglossum 44 



The Embryo of Botrychium 46 



The Embryo of Helminthostachys 54 



III. Tin- Young Sporophyte 55-84 



The "\oung Sporophyte ol Ophioglossum 55 



The Young Sporophyte of Botrychium 50 



The Young Sporophyte of Helminthostachys " 



Comparison of the Young Sporophvtes of the ( )phinglossacex Si 



IV. I in \iui r Sporophyte 85-116 



["he Sporophyte of Ophioglossum 86 



The Anatomy of Euophioglossum 89 



The Root in Euophioglossum <;,> 



Anatomy of Ophioderma 94 



Anatomy of Cheiroglossa 99 



The Sporophyte of Boti ychium 99 



The Sporophyte of Helminthostachys 104 



The Sporangiophore of the Ophioglossales 108 



The Development of the Sporangiophore 1 10 



The Development of the Sporangium 112 



