20 



IV. Elachistea. Fries. 



Frond parasitical, composed of tufis of free-jointed filaments, 

 springing from a common base. 

 E. I it cicala, Velley ; L. I. Sound. 

 E fluccida, Dillwm; L. J. Sound. 

 E. curia, Dillwin ; Greenport. 



Order VI.— ECTOCARPACEiE. 



Frond, articulated filaments. Spores external, and attached to 

 ramuli, which is jointed. Contains three American genera, namely — 

 I. Sphacelaria, Lyngb. — Name, gangrene. 

 ]T. Cladostephus, Ag — Name, branching crown. 

 III. Ectocarpus, Lyngb. — Name, external fruit. 



I. Sphacelaria. Lyngb. 



Frond filamentous, rigid. Each articulation formed of numerous 

 cells. 



S. cirrhosa, Rothweil ; Stonington. 



II. Cladostephus- Ag. 



Frond inarticulate, rigid. Short jointed ramuli, which are whorled. 

 C. spongiosum, Hudson ; Massachusetts Bay. 

 C. verticillatus, Lyngb. ; Rhode Island. 



III. Ectocarpus. 

 Frond filamentous, flacid. Each joint formed of a single cell. 

 Spores external. 



E. htoralis, Lyngb. ; common. 

 E. veridis. Harvey ; N. V. Bay. 

 E. tomentosus, Hudson; L. I. Sound. 

 E. faiiculat.us, Har. ; Rhode Island. 

 E. si/iculosus, Har. ; N. Y. Bay. 

 5 Sp. ? or new. 



Miscellaneous Melonosperms. 



Agarum Cribosum ; Massachusetts Bay. 

 Acetubularia. Sp. ? or new ; Key West. 

 Caulerpa Wurdemannia ; Key West. 

 C Coccinia, Harvey; Florida. 

 8 Sp. ? or new ; Key West. 

 Dasvcladis Claviformis ; Key West. 

 Cladoucaepitosa Sp. ? or new; Key West. 

 Pencillus. Sp. ? or new; Key West. 

 Flabbelaria. 2 Sp ? or new ; Key West. 

 11 other Melanosperms not determined. 



