THE MARINE BOTANIST. 23 



GENERA OF THE SPOROCHNUS TRIBE. 



Family 1 of the Arthrocladia, 

 With their spores attached to slender filaments. 



Desmarestia, Frond solid, either filiform or flat, 



distichously branched. 

 Arthrocladia. Frond cylindrical, furnished with 



whorls of small, slender, jointed filaments. 



Family 2 of the Sporochnus. 

 With their spores produced in knob-like receptacles. 



Sporochnus. Receptacles lateral, on short stalks. 

 Carpomitra. Receptacles terminal at the tips of 

 the branches. 



DESMARESTIA. 



Named in honour of A. G. Desmarest, a celebrated French 

 Naturalist. 



Frond linear, either fihform, flat, or compressed ; 

 when young" furnished with soft green filaments. 

 Fructification unknown. 



