THE MARINE BOTANIST. 307 



by Mrs. Gatty, and described in the Phycolog'ia as 

 resembling externally somewhat C. uncialis and 

 Ectocarpus littoralis; but the threads are very 

 much more robust than in the former, and dif- 

 ferently branched from the latter, as well as more 

 robust. 



RHIZOCLONIUM. 



Name, meaning a rooted branch. 



Filaments green, jointed, uniform, decumbent ; 

 simple or spuriously branched ; branches short and 

 root-like. Fruit granules contained in the cells. — 

 Harv, 



RHIZOCLONIUM RIPARIA.— TWISTED 

 RHIZOCLONIUM. 



Filaments very slender, entangled, and ilaccid ; 

 slightly branched above, and with a few root-like 

 branches below. This forms wide dense strata, of 

 a pale green colour, spreading over sand-covered 

 rocks near hio-h water-mark. Not uncommon. 



