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. 
Canda. 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. 
