450 VEGETABLE PHYSIOLOGY 



of the nucellus of the ovule, the buds growing into the 

 cavity of the megaspore and there developing into 

 embryos. This is not quite the same thing as the apo- 

 gamy of the Fern, as the new sporophyte arises as a bud 

 upon part of the sporangium that is, upon the parent 

 sporophyte and not upon the gametophyte. It is really a 

 curious variation of vegetative propagation. 



