THE ALGAE OF BERMUDA. 



19 



1845-49, p. 25, PI. XXXVII, fig. I; P. B.-A., No. 2054. Among 

 other algae in a coating on rock between tide marks, North Shore, 

 Sept., Collins. 



3. S. SUBSALSA forma oceanica Gomont, 1893, p. 274; P. B.-A., 

 No. 2053. Among other algae at various stations. 



OsciLLATOEiA Vaucher. 



1. Filaments torulose. 

 1. Filaments not torulose. 



2. Trichomes 18-36 ^i diam., loosely spiral. 



2. Triohomes not spiral. 

 3. Triohomes and stratum duU red. 

 3. Trichomes and stratum not red. 



4. Limioolous; trichomes 17-29 m diam. 



4. Trichomes 6-11 /i diam. 

 5. Limioolous or saxicolous; black-oUve. 

 5. Epiph3rtie; aeruginous, light green or light brown. 



6. Trichomes not attenuate at tip. 



6. Trichomes attenuate at tip. 

 7. Trichomes 4r-10 m diam. 

 7. Trichomes less than 3 m diam. 



8. Apical cell capitate. 



8. Apical cell not capitate. 

 9. Trichomes 3 m diam. or more. 

 9. Trichomes less than 3 m diam. 



10. Distinctly marine. 



10. Plant of fresh water pools. 



2. 



6. 



1. O. Bonnemaisonii. 



3. 



2. O. miniata. 



4. 



3. O. margaritifera. 



5. 



4. O. nigro-viridis. 



5. O. CoraUinae. 



7. 



8. 



6. O. tenuis. 



7. O. amphibia. 



8. O. amoena 



9. 



10. 



11. O. longearticulata. 



9. O. laetevirens. 



10. O. formosa. 



1. 0. Bonnemaisonii Crouan ex Gomont, 1893, p. 235, PI. VI, 

 figs. 17-18; P. B.-A., No. 2055. Forming fioating masses in ditch 

 in Pembroke Marsh, Aug., Collins. 



2. O. MINIATA Hauck ex Gomont, 1893, p. 236; P. B.-A., No. 2156. 

 Hungry Bay, April, May, Collins. Forming a deep red film on the 

 bottem, also floating clots adhering to everything. The filaments are 

 usually about 20 ^ diam., but occasionally as high as 45 fx. The plant 

 decays very quickly, and even when put on paper with a promptness 

 ample for most Oscillatorias, the coloring matter stains the paper pur- 

 ple, and the filaments remain nearly colorless. 



3. O. MAEGARITIFEEA Kiitzing ex Gomont, 1893, p. 236, PI. VI, 

 fig. 19. In brackish pool with other algae, April, Sept., Collins. 



4. 0. NIGRO-VIRIDIS Thwaites ex Gomont, 1893, p. 237, PI. VI, 

 fig. 20. On rocks wet by salt water, Jan., Farlow. 



