17 



35. Ophiocytiuin: 

 (0. cochleare.) 



Cellulae aut singulae aut 

 intricatae, vcrmiculari-in- 

 curvae, altero fine mucro- 

 natac, altero obtusae, 

 1 loo auctae. 



3f)b. Sciadium 



(S. Arbuscula.) 



Cellulae rectae, a et b. in 

 , statu juvenili; c. indivi- 



duuni corymboso - um- 



bellatum. 



36. Pediastrum: 



(P. Rotula.) 





^sV^i a - Ceilula singulasinuato- 

 quadriloba ; b. Coeno- 

 bium e cellulis 4, c. e 

 cellulis 5-[-ll -com- 

 positum. 



Rabenhorst, Flora Europaea. III. 



