Contents 



CHAPTER PAGE 



I Scope and Outlook 1 



II Factors in Embryogenesis 6 



III Factors in Embryogenesis {continued) 22 



IV Embryogenesis in the Algae 40 

 V Embryogenesis in the Bryophyta 63 



VI Embryogenesis in the Psilotales and Equisetales 85 



VII Embryogenesis in the Lycopodineae : 



Lycopodium and Phylloglossum 93 



VIII Embryogenesis in the Lycopodineae: 



Selaginella and Isoetes 107 



IX Embryogenesis in Eusporangiate Ferns 125 



X Embryogenesis in Leptosporangiate Ferns 142 



XI Embryogenesis in Gymnosperms: 



Cycadales and Ginkgoales 171 



XII Embryogenesis in Gymnosperms: 



Coniferales and 'Gnetales' 189 



XIII Embryogenesis in Flowering Plants : General Section 223 



XIV Embryogenesis in Flowering Plants : Special Section 252 



XV Embryogenesis in Flowering Plants: 



Analytical and Experimental Investigations 294 



XVI General Conclusions. 317 



Bibliography 337 



Index 365 



IX 



69a 



