THE GREEN ALGAE OK NORTH AMERICA 345 



opposite one or more of them ; this ramification continued, the 

 ultimate ramuli of very few cells, 80-100 /u. diam., cells i}4-2}4 

 cliam. long. Cal. 



A stout but graceful species, with a characteristic ramifica- 

 tion like that of Microcladia borcalis Ruprecht. There is consid- 

 erable variation, according as the main divisions are straight or 

 flexuous, the branches close or distant, erect or recurved ; but 

 the peculiar symmetrical ramification will distinguish it from 

 any other of our species. As many as four cells may sometimes 

 be found issuing from the much widened top of a cell, all flabel- 

 lately arranged in one plane. 



26. C. FASCICULARIS (Mert.) Kiitzing, 1843, p. 268; P. 

 B.-A., Nos. 122, 1228, 1472; Vickers, 1908, p. 18, PI. XIII ; 

 Conferva fascicularis Montagne, 1839, p. 4, PI. VII, fig. i. 

 Fronds elongate, up to 50 cm. long ; main filaments and princi- 

 pal branches flexuous, sparingly alternately branched, the ends 

 beset with rather long, pectinate, more or less densely fascicu- 

 late ramuli; main filaments 200-250 p. diam., cells 2-4 diam. 

 long; ramuli 80-120 p. diam., cells usually 1-2 diam. long. 

 Florida, W. I. So. America. 



A common and quite variable species, something of the range 

 of variation "being shown by the specimens distributed in 

 P. B.-A. 



27. C. LAETEVIRENS (Dillw.) Harvey, 1846-51, PI. CXC ; 

 1858, p. 82 ; Farlow, 1881,- p. 53 ; Conferva glomerala Wyatt, 

 Alg. Danm., No. 143. Filaments 50-150 /u, diam., rigid, yellow- 

 green, much branched ; branches erect, often opposite ; ultimate 

 ramuli short, obtuse or subacute, densely fastigiate at the tips 

 of the branches ; fronds up to 20 cm. long ; cells in main 

 branches 6 diam. long, in ramuli 3 diam. 



A stout and rather coarse species, best characterized by the 

 dense tufts at the ends of the branches, formed of stout, blunt 

 ramuli ; it grows at the lower limit of the literal or in the sub- 

 litoral zone, and is not a common species. The reports of this 

 species from the west coast are all doubtful. Me., Mass. 



28. C. HUTCHINSIAE (Dillw.) Kiitzing, 1845, p. 210; Har- 

 vey, 1846-51, PI. CXXIV ; Farlow, 1881, p. 53. Fronds glau- 

 cous green, up to 40 cm. high ; filaments 120-300 /* diam., stiff, 

 flexuous, sparingly branched ; ramuli few, secund, blunt, with 

 constricted nodes; cells 2-3 diam. long-. Florida and W. I. to 

 New Jersey ; Vancouver Island. Europe. 



