32 



GENERA. 



FIRST CLASS.— FIRST ORDER. 



Elzarina. Cylindrical and in articulated. Cells dis- 

 persed, and almost projecting. 



Cellaria. Cylindrical and articulated. Cartilagi- 

 nous and stony, cells dispersed. 



Caberea. Slightly compressed and articulated. 

 Cellular in front, and furrowed in the back. 



Cauda. Dichotomous, and fan- shaped. Branches 

 united by diverging side fibres. 



GENERA. 



FIRST CLASS.— FIRST ORDER. 



Acamarchis. Dichotomous. Cells in united for- 

 mation, alternate and vesicular. 



Crisia. Cells generally alternate, slightly projecting, 

 and opening on the same side. 



Menipea. Articulated. Cells grouped in wreaths, 

 opening only on one side. 



