23 



C. divaricata, Harvey ; N. Y. Bay, &c. 

 C. uvifera ; Key West. 



III. Chylocladta. Greville. 



Frond hollow, constricted, chambered, filled with watery juice. 

 Spores spherical or conical. Telraspores in small ramuli, and tri- 

 partite. 



C. parvula, Agardh ; N. Y Bay, &c. 



C. Mediterranean ; Key West. 



2 Sp. 1 or new. 



Order III.— CORALLINACE.E. 



Frond purplish when recent, rigid, jointed, mostly calcareous, 



carbonate of lime being deposited in the cells. Tetraspores tutted, 



contained in spherical conceptacles. Contains seven nalive genera. 



> I Corallina, Linn. IV. Amphiron. 



II. Jania. Lamour. V. Liagora. 



III. Halimeta. VI. Helimedia. 



VII. Digenia. 



Genus I. — Corallina. Linn. 

 C. officinalis, Linn. ; Greenport, &c. 



C. St. Anthony's beads ; Key West. 



II. Jania. 

 J. 1 Sp. ? or new ; Florida. 



III. Halimeta. 

 H. I Sp. ? or new ; Florida, 



IV. Amphiron. 

 A. 1 Sp. ? or new ; Key West. 



V. Lugora. 

 Lr 2 Sp. ? or new ; Key West. 



VI. Helimedia. 

 H. opuntia ; Key West. 



VII. Digenia. 



D. samplex ; Key West. 



0»der IV.— DELESSERIACE.E. 



Frond usually leafy, rarely filiform, areolated, inarticulated Con- 

 ceptaclts external or half immersed. Tetraspores scattered over 

 the frond, or in proper fruit leaflets. Contains three genera, 

 namely — 



