42 THE MARINE BOTANIST. 



broad-fronded form of this plant was formerly 

 described as a distinct species^ under tbe name of 

 X. dehilis. 



CHORDA. 



Name chorda, a cord. 

 Frond simple^ filiform, cylindrical, internally 

 hollow, and divided into separate compartments 

 by transverse partitions. Moot scutate. Fructi- 

 fication external, continuous masses of pear-shaped 

 seeds attached at their base. 



CHORDA FILUM.— STRING-LIKE CHORDA. 

 '' SEA-LACES." 



Fronds from one to twenty feet long-, homy, 

 without external constrictions, dark olive-brown, 

 shiny, covered with pellucid hair-like filaments, 

 tapered at both ends. The fructification covers 



