XXII. NAIADES. 



809 



Phucagrostis major. 



Longitudinal section of a root and rootlet, showing the 

 pileorhiza (mag.). (Bornet.). 



Zoskra marina. 

 Fructiferous spathe. 



Caulinia fragilis. 

 9 flower (mag.). 



Caulinia. 

 Dehiscent peri- 

 carp without the 

 seed (inag.). 



Phucagrostis major. 

 3 plant. (Bornet.) 



Caulinia. Seed (mag.). Caulinia. Embryo (mag.). 



Zostera marina. 

 Upper end of spathe. 



