198 



BOTANY 



way into it ; but normally only a single one penetrates into the egg 

 and fuses with its nucleus. 



The Embryo. The fertilized egg does not form a resting-spore, 



A. 



C. 



FIG. 159. Targionia hypophylla. A, section of the venter of a ripe archegonium 

 (X 500). B-D, development of the embryo, seen in longitudinal section (X 500). 

 E, F, X 250. 



but grows into a mass of tissue, the embryo (Fig. 159), which sooner 

 or later develops into the sporophyte, the plant which gives rise to 

 the non-sexual spores. 



