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 ca'se, with lid (c) detached ; D, 

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

 dividing egg-cell (o) ; 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). 



