28 



C. clavulatum, Ag. ; Key West. 

 11 Sp. 1 or new. 



III. Spyredia. Harvey. 



Frond filiform, cylindrical, and much branched. Ramuli bristly, 

 simple, jointed. Fruit stalked, surrounded by short ramuli, Tetras- 

 pores with colorless border, and attached to the ramuli. 



S.jilar/ientosa, Wiilf; L. I. Sound, &c. 



S. 4 Sp. ? or new. 



IV. Griffithsia. Ag. 



Frond filiform, articulated, dichotomous, rosy red ; ramuli single 

 tubes, whorled. Fruit round and gelatinous, involucrated recep- 

 tacles. Tetraspores fixed to whorled ramuli. 



G. corallina, Linn. ; Greenport, ccc. 6cc. 



G. Devoniensis ; Greenport. 



V. Wrangelia. Ag. 



Frond articulated, pinnate, filiform, filaments single tubed. Fruit 

 gelatinous, terminating the branches, pear-shaped, involucred. 

 Tetrasposes fixed to the ramuli. 



W. Sp. 1 or new ; Florida. 



VI. Seirospora. Harvey. 

 Frond filamentous, articulated, one-tubed. Tetraspoies in ter- 

 minal, bead-like strings. 



S. Gtifithsiana, Harvey ; New Haven. 



VII. Callithamnion. Lyngb. 



Frond filiform. Stem opaque, sometimes jointed. Branches 

 jointed, one-tubed, and pinnate. Fruit, berry-like receptacles on 

 the main branches. Tetraspores scattered along the ultimate 

 branches, or borne on little foot stalks. 



C. Bailey ii, Harvey ; X. V. Bay. 



C. plumula, Ellis ; New London. 



C. unilateral!, Harvey; X. 1. Bay. 



C. cruciatum, Ag. ; Greenport. 



C. Americanum, Harvey; New London. 



C. Turnerii, Dillwin ; New Haven. 



C. brachiatum ; Savbrook. 



C. Rothii, Lyngb. ; Rhode Island. 



C. arachnocedeinn, Ag. ; Rhode Island. 



7 Sp. ? or new. 



Miscellaneous Rhodosperms. 



Amansia Multifida ; Key West. 

 Helminiochorton. Sp. 1 or new ; Key West. 

 Acouthophora, Sp, ? or new ; Key West. 



