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, 
