29 



Alsidium Triquetrum ; Florida. 

 Alsidium Triangulare, J. Ag. ; Florida. 

 Trentefolia Pulchella ; West Point (fresh water.) 

 6 Sp. ? or new. 



Series III. 



CHLOROSPERMEil. 



Grass green Sea-weeds, rarely purple. Simple in formation. 

 Fructification dispersed through all parts of the frond ; the whole 

 coloring matter convertable into propagula. Sporidia, within the 

 cells, often at maturity vivacious, moving by vibratile cilia ; conio- 

 cystce, ultimately separating from the frond. Marine or fresh water. 

 This series consists of six marine orders, namely — 



1. Siphonace^e. 4. Oscillatoriace^e. 



2. CoNFERVACEiE. 5. NoSTOCHACE^E. 2- 



3. Ulvaceje. 6. Palmellace^e. 



Order I.— SIPHONACE^. 



Cells filiform, of great length, simple or branched. Contains 

 three genera, namely — 



I. Codium, Stockhouse. — Name, skin of animal. 

 Filaments closely combined into a spongy-like frond. 



II. Bryopsis, Lamour. — Name, moss-like. 

 Filaments free, pinnately branched. 



III. Vaucheria, De Cand. 

 Filaments free, irregularly branched. 



Genus I. — Codium. Stack. 

 C, tomentosum, Hudson ; Florida. 

 C. 1 Sp. ? or new ; Apalachicola. 



II. Bryopsis. Lam. 



B. plumosa, Hudson ; N. Y. Bay. 

 B. hypnoides, Lamour ; N. Y. Bay. 

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



III. Vaucheria. 



V. velutina, Hudson ; West Point. 

 V. ccespitosa ; West Point. 

 V. racemosa ; Georgia. 



Order II.— CONFERVACE^. 



Confervaceas are either of marine or fresh water, and comprise an 

 extensive range, composed of jointed filaments either simple or 



