THE GREEN ALGAE OF NORTH AMERICA 341 



rarauli 40 /x diam., secund, blunt; cells 3-6 diam. long. In 

 warm pools and lagoons. Newfoundland to New Jersey. 



Europe. 



Common in summer in marsh pools and lagoons where the 

 temperature is high and the level varies little ; at first attached, 

 it soon rises to the surface, and ultimately forms a dense felty 

 coating, continuous over large stretches of water, usually mixed 

 with Lyngbya aestuarii and species of Entcromorpha. It will 

 probably be found to extend in both directions beyond the 

 limits given. Reports of C.fracta from marine stations prob- 

 ably should be referred to this species. 



Var. GLOMERATA Thuret in Le Jolis, 1863, p. 61 ; P. B.-A., 

 No. 1027. Ramuli in closely set tufts. Long Island Sound. 



Europe. 



The tufted ramuli give quite a distinct appearance ; otherwise 

 it is like the type. 



17. C. SCITULA (Suhr) Kiitzing, 1849, p. 399; 1854, PI. 

 XII, fig. i ; Conferva scitula Suhr, 1831, p. 685 ; 1834, PL II, 

 fig. 2. Frond small, brownish-green, stiff, densely fascicled ; 

 filaments erect, branching, branches erect, connate at the base, 

 above recurved, with short, secund ramuli ; lower cells 75-110 /j. 

 diam., 2-4 diam. long. W. I. 



The figure by Suhr shows a small, perhaps immature plant 

 with a few simple, slightly recurved branches and many short, 

 secund ramuli ; the figure by Kiitzing, apparently from an older 

 plant, shows rather virgate main axes, densely set with some- 

 what secund branches ; the ramuli at the ends of the branches 

 arranged much as in Ectocarpus fascicidatus. The cells in the 

 main axes are about 3 diam. long ; in the ramuli 1-2 diam. 

 long ; the tips are blunt and rounded. The description above 

 is from Kiitzing, and there is possibly a doubt as to the identity 

 with Suhr's plant ; if they are not the same, Kiitzing's had 

 better stand for the species, as Suhr's figures and descriptions 

 are hardly sufficient. There is no recent record of it. 



1 8. C. BRACHYCLONA Montagne in Kiitzing, 1849, p. 394 ; 

 1853, PL XCVI, fig. 2. Fronds loosely tufted, pale green or 

 yellowish, 10-15 cm. high; filaments di- polychotomous, 150- 

 250 /j. diam., in main divisions; branches at first distant, then 

 more abundant ; ramuli very short, often of a single cell, alter- 

 nate, opposite or secund, 50-75 ft diam.; cells of main divisions 



