MODES OF REPRODUCTION IN PLANTS. 



167 



There is a close resemblance to the embryo sac of Gymnosperms 

 (pines, spruces, etc.). The prothallus is verj much reduced, and pro- 



FiG. 14. 



jects through the slit in the spore-covering. In the development of 

 the female germ-cell after fertilization, there is an elongation of the 

 upper part (see e, Fig. 14), forming the part called the suspensor, a 



ar 



Fig. 15. 



body which is not found in other cryptogams, but is present in embryos 

 of flowering plants. 



We now pass to phenogamous or flowering plants, in which the 



