460 VEGETABLE PHYSIOLOGY 



more of the cells of the nucellus of the ovule, the buds grow- 

 ing 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 sporo- 

 phyte and not upon the gametophyte. It is really a curious 

 variation of vegetative propagation. 



