THE MARINE BOTANIST. 287 



MARINE GENERA OF THE SIPHONACE^ 

 TRIBE. 



Codium, Filaments closely combined into a sponge- 

 like frond. 

 Bryopsis. Filaments free, pinnately branched. 

 Vaucheria. Filaments free^ irregularly branched. 



CODIUM. 



Name meaning the skin of an animal, from the soft shaggy 

 substance. 



Frond spongy, dark-green (crustaceous, globular, 

 cylindrical, or flat), composed of an interwoven 

 mass of tubular, continuous filaments. Fructifica- 

 tion : opaque vesicles attached to the filaments near 

 the surface of the frond. — Grev, 



CODIUM TOMENTOSUM.— FORKED- 

 SPONGY CODIUM. 



Frond six to twelve inches long, spongy, cylin- 

 drical, and more or less regularly forked. Structure 



