INDEX 



275 



Vallisneria, 23 



Vascular bundles, systems of, 35 ; 



of Sunflower, 37, &c. ; of Maize, 



96 ; of Ferns, 160 

 Vaucheria, 219 

 Velum partiale, 227 

 Ventral canal-cell, 148, 176, 184 

 Vessels, 41, 44 



WATER STOMATA, 82 

 Wood, see Xylem 



XYLEM, of Sunflower, 41, c. ; of 

 Elm, 56, 65 ; of Pine, 136 



Xylem fibres, 41, 56, &c. 

 Xylem parenchyma, 41, 56, c. 



Yucca, stem of, 98 



Zea, 95 



Zoogonidia, 221 

 Zygnema, 223 



Zygospores, of Sporodinia, 245 

 Zygote, of Spirogyra, 225 ; 

 Sporodinia, 246 



