no 



0' 



c 



p.? 



f 



c-^-. 



>'■ 



Fig. 271. — Development of the stomata. A-C, Surface views of very young stomata of 

 E. telmateia, X600; D, section of an older stoma of E. limosiim, X700 (after 

 Strasburger) ; E, outer surface of a complete stoma of E. telmateia, showing the 

 silicious nodules upon the epidermal cells; F, inner side of the same, showing the 

 silicious bars upon the inner walls of the guard cells; v, v, accessory cells; s, 

 guard cells. 



