THE ALGAE OF BEEMUDA. ■ 43 



1. R. Kekneri Stockmayer, 1890, p. 582; Collins, 1909, p. 329. 

 Forming a coating on mangroves. Hungry Bay, April, Collins. 



*2. R. HiEKOGLTPHicuM (Ag.) Kiitzing, 1845, p. 206; Collins, 

 1909, p. 329; P. B.-A., No. 2009; Conferva hieroglyphica Agardh, 

 1827, p. 636; Pool in rock by Old Ferry landing, Aug. ; ditch in South 

 Shore marshes, Sept., Collins; artificial reservoir near Spanish Rock, 

 Feb., Hervey. Mostly the typical form, but with some var. macro- 

 meres Wittr. 



3. R. EiPABiUM (Roth) Harvey, 1846-51, PI. CCXXXVIII; 

 ColHns, 1909, p. 327; Conferva riparia Roth, 1806, p. 216; Hungry 

 Bay, AprU, Collins; Causeway, Nov., Hervey. On mangroves and 

 other objects between tide marks; apparently not very common; 

 mostly the form known as var. implexum (Dillw.) Rosenvinge. 



4. R. HooKEEi Kiitzing, 1849, p. 383; 1853, p. 21, PL LXVII, 

 fig. Ill; Collins, 1909, p. 330. Shore of Harrington Sound, April; 

 Hunjgry Bay, May, Collins; Walsingham, Jan., Hervey. A rather 

 coarse species, varying in diameter of filaments from 50 to 100 /x; 

 the same filament is not infrequently double the diameter in one part 

 that it is in another. The branches are mostly short, but have dense 

 chromatophores the same as in the cells of the filament. Beside the 

 localities given, it occurs on the walls of caves along high water mark, 

 and on shaded sides of quarries, and even in reservoirs of quite fresh 

 water. 



5. R. CRASSiPELLiTUM W. & G. S. West, 1897, p. 35; Collins, 1909, 

 p. 330. In small pools, Ely's harbor, April, Hervey. 



Cladophoea Kiitzing. 



1. Fresh water. 19. C. fracta. 



1. Marine. 2. 



2. With distinction of prostrate and erect filaments. 16. C. Howei. 

 2. No distinct prostrate filaments. 3. 



3. Forming a low matted expansion. 4. 



3. Erect. 5. 



4. Filaments 100-150 fi diam. throughout. 17. C. repens. 



4. Filaments 70-100 /j. diam. below, 60-80 /i above. 18. C. frascatii. 



5. Main filaments 160 n diam. and upwards. 6. 



5. Main filaments seldom reaching 150 n. 10. 



6. Lower cells 10 diam. long or more. 14. C. catenifera. 

 6. Lower cells less than 10 diam. long. 7. 



7. Diam. of filaments about the same throughout. 15. C. fuhginosa. 



7. Terminal divisions markedly smaller than main axes. 8. 



