THE MARINE ALGM OF SOUTH CAROLINA AND FLORIDA. 259 



critical specimens. He wrote to me ' that of those sent some three or 

 four were in all probability undescribed, 



Melanosperme^ , 

 Fticacea. 



1. Sargassum vulgare^ Ag. Abundant at Cedar Keys, Gulf of 

 Mexico, and Key West. 



2. S. lacciferum, Ag. Equally common with the preceding, and 

 also found on Sullivan's Island in a fragmentary state. 



3. S.filipendida, Ag. I obtained one specimen of this rare species 

 at Key West, but found it more common at Cedar Keys, West Florida, 

 where it appeared more frequent than S. vulgare. It was unknown 

 to Harvey, Ner. Eor. Am., i., p. 61. 



Besides these three species I found two forms at Key West, which 

 in a live state appeared most distinct, but are almost impossible to 

 determine with certainty from herbarium specimens, 



BictyotacecB. 



4. Padina pavonia, Lmx. Small, and altogether inferior to Devon- 

 shire specimens. Growing on the coral reefs at Key West. 



5. Zonaria lolata, Ag. Common at Key West in March. 



6. Dictyota fasciola, Lam. Abundant at Key West. There appear 

 to be two forms of this plant, one somewhat resembling the var, 

 intricata of B. dichotoma, with linear, entwining branches. 



7. D. Bartyresiana, Lmx. One small specimen was referred to this 

 species, which, as it occurs at Yera Cruz and likewise at Bermuda, 

 being among the Algas found there by the " Challenger " expedition, 

 may not without reason be expected to be found by some future algo- 

 logist as common on the Florida keys. 



8. B. dichotoma, Lmx. Sullivan's Island, Charleston, Key West, 

 Not abundant. 



9. B. ciliata, J. Ag. Harvey states (Ner. Bor. Am., pt. i., p. 110) 

 that this was abundant at Key West in February, 1850. I found it 

 in March, 1872, infinitely rarer than D.fasciola. 



10. B. acutiloha, Ag. One specimen, determined by Prof. J. G. 

 Agardh, in lit., December 21st, 1872. Key West, thrown up from 

 deep water after a storm ; new to .Florida. 



11. Asperococcus sinuosus, Bory. Rare at Key West. 



12. Asperococcus intricatus, J. Ag. A fragment, fd md floating, was 

 referred by Prof. A. J. Agardh as in all probability*, belonging to this 

 species. This is the first record of its occurrence on the shores of the 

 IJnited States. 



13. Hydroclathrus cancellatus, Bory. Eare at Key West. It is very 

 difficult to preserve specimens, owing to the rapidity with which the 

 plant decays upon exposure to the air. 



Fctocarpacem. 



14. Ectoca/rpu8 siltculosus, Lyngb. Charleston Harbour, 



15. Ectocarpus viridis, Harv. Charleston Harbour. 



Rhodosperme^. 

 Mhodomelacece. 



16. Amansia muUifida, Lmx. Very rare at Key West. 



s 2 



