The Endosperm in Inheritance 145 



situation is clear. After the germination of the mega- 

 spore, everything within the old megaspore wall is 



Gymnospem 



Archegoruum 



Egg 



Old Megaspore 



Wall, Inclosing 



emale GametophyU. 



Egg 

 Fusion Nucleus 



Old Megaspore 



Wall, Inclosing 



Female Gametophyte 



Angiosperm- 



OVULE 



dymnospcnn 



Embryo 

 Megaspore Wall 



Endosperm 



Endosperm 



Angiosperm 



SEED 



FIG. 34. Diagrams contrasting young ovules and mature seeds of 

 gymnosperms and angiosperms. 



gametophyte tissue; fertilization affects the egg only, 

 resulting in a sporophyte embryo. In the seed, there- 

 fore, the embryo is imbedded in nutritive tissue which is 



