THE GREEN ALGAE OF NORTH AMERICA 347 



32. C. CATENATA (Ag.) Ardissone in Rabenhorst, Algen, 

 No. 1293. Fronds densely tufted, dark green, stiff, up to 8 cm. 

 high; filaments much branched, di- trichotomous below, 200- 

 250 /u. diam. ; 80-150 p. in ratnuli ; cells 3-6 diam. long, nodes 

 constricted ; ramuli opposite, secund or irregularly placed, 

 somewhat fasciculate; terminal cell usually obovoid. Jamaica. 



Europe. 



Found throughout the Mediterranean, but so far reported at 

 only this one locality in America. Somewhat like a more 

 delicate' C. prolifera. 



33. C. CATENIFERA Kiitzing, 1849, p. 390; 1853, PI. 

 LXXXIII, fig. i. Fronds stiff, cartilaginous or horn-like, 

 flexuous, more or less densely branched, up to 50 cm. high ; 

 main filaments 300-500 p. diam. at base, alternately or sometimes 

 oppositely branched, branches patent, the last series bearing 

 opposite or alternate, more or less densely fasciculate ramuli, 

 100-225 p. diam.; cells in main stem long, up to 20 diam., cylin- 

 drical ; in branches 8-10 diam., slightly constricted at nodes; 

 in ramuli 1^-2 diam., oblong. Jamaica, Bermuda. 



Cape of Good Hope. 



A noble plant in its larger forms, resembling mostly C. pellu- 

 cida, under which name it has sometimes been reported. That 

 species, however, is quite regularly di- polychotoinous, branch- 

 ing at the top of each cell. C. catenifera varies much as to its 

 rigidity or softness, and as to the density of the fascicles of 

 ramuli ; but the other characters seem to be quite permanent. 



34. C. GRAMINEA Collins, 1909, p. 19, PI. LXXVIII, fig. 6. 

 Loosely tufted, 10-15 cm - high, dark green, cartilaginous, dis- 

 tantly di- trichotomous, all divisions erect ; main filaments 

 about 300 p. diam., ultimate divisions about 150^ diam., tips 

 blunt or slightly acute ; cells very long below, up to 30 diam., 

 shorter above ; normally occupying the space from one forking 

 to another ; ultimate branches 4-6 diam. long; cell walls usually 

 strongly striate. Cal. 



Distinguished from all our other species by the long cells, each 

 normally extending from one forking to the next ; in this it 

 agrees with C. pcllucida (Huds.) Kiitz. of Europe, but in the 

 latter there is more reduction of size in the successive orders of 

 branches, the main filament being sometimes as large as 500 p. 

 diam., while the ultimate ramuli are seldom over 50 p., and are 

 dense and more or less fasciculate. In C.graminea there is 



