PLANT CLASSIFICATION 



165 



reaches an egg-cell they fuse, the two nuclei unite, and a fertilized 

 egg-cell is formed. This fertilized egg, by the process of growth and 



FIG. 84. Development of a moss plant. 



A, moss plant with spore case (k) having a lid (c) ; z, rhizoids ; B, young 

 moss plant ; C, enlarged view of spore case, with lid (c) detached ; D, 

 single sperm-cell ; E, spermary with escaping sperms ; F, ovary with 

 dividing egg-cell (6) ; G, branching protonema ; H, spore germinating to 

 form protonema. 



cell division (Fig. 84, F, o), finally forms the slender stalk with the 

 capsule and spores at the end of it like that referred to in 181 

 (Fig. 84, A, C). 



