DEVELOPMENT OF PLANTS 



307 



rounded on the outside, and less commonly on the inside, by 

 loose chlorophyll-bearing cells which extend down to the base 

 of the capsule where chlorenchyma and stomata are developed. 

 This lower region of the capsule, the apophysis, is often enlarged 

 and provided with air spaces and stomata, thus constituting the 

 chief photosynthetic apparatus of the sporophyte (Fig. 210, 



FIG. 211. Structure of capsule of Funaria: 5, capsule with calyptra, A, 

 removed. 6, section of nearly mature capsule sp, spore-forming cells sur- 

 rounded on outside by loosely arranged chlorophyll-bearing cells; o, oper- 

 culum; r, annulus; p, peristome; a, apophysis. 8, magnified view of a 

 portion of the capsule, showing the annulus, r, and the thick-walled cells 

 of the peristome, p, which are attached at their base to the epidermis by 

 a double row of cells; sp, spore-forming cells, the dotted line should run to the 

 four roundish cells at the left. 7, the cells shown in 8, p, have split apart, 

 thus forming the inner and outer teeth-like segments of the peristome. After 

 Sachs. 



