34-8 TUFTS COLLEGE STUDIES, VOL. II, No. 3 



comparatively little diminution in size, and the tips are loose 

 and open. In C. pellucida the divisions of the di- or trichotomy 

 are usually equal and develop equally ; in C. graiuinea one is 

 often much reduced, sometimes only a singla cell. 



35. C. PROLIFERA (Roth) Kiitzing, 1845, p. 207 ; 1853, PL 

 LXXXII, fig. 3; Vickers, 1908, p. 18, PI. XII; Wittr. and 

 Nordst., Alg. Exsicc., No. 1043. Fronds dense, dark green 

 when growing, blackish when dried, up to 20 cm. high, rarely 

 more ; filaments coarsely membranaceous or cartilaginous, 

 300-400 p. diam., di-trichotomous, divisions mostly erect, more 

 frequent towards the somewhat fastigiate tips ; ramuli 130-200 

 [t. diam., blunt; cells up to 20 diam. in main filaments, much 

 shorter in the branches, 4-6 diam. long in the ramuli. In lower 

 litoral zone and in shallow water, Porto Rico, Barbados. 



Europe. 



A coarse, dark colored, rather unsightly plant, common in the 

 Mediterranean, and generally in the warmer Atlantic. 



36. C. FULIGINOSA Kiitzing, 1849, p. 415. Forming large, 

 dark brownish-green tufts ; filaments hard, stiff, more or less 

 densely matted, 150-160 /j. diam.; cells cylindrical, 5-10 diam. 

 long ; the main axes long, set with short, blunt ramuli, often 

 in secund series. Florida, W. I. 



This species was described from Cuban specimens, and has 

 apparently never been since reported. The writer is indebted 

 to Dr. Bornet for calling his attention to the fact that it is ap- 

 parently the same as the Cladophora that, in combination with 

 an endophytic fungus, Blodgcttia Bornet i Wright, 1881, p. 21, 

 PI. II, figs. 1-4, makes up the Blodgettia confcrvoidcs Harvey, 

 1858, p. 48, PI. XlyV.C, and which was distributed under the 

 last name as P. B.-A., No. 314. The hyphae of the fungus may 

 possibly occur in connection with some other species of Clado- 

 phora, but in all specimens observed the host agrees fairly 

 well with the description of C. fnliginosa. 



37. C. MAGDALENAE Harvey, 1846-51, PI. CCCL,Y.A ; 

 Farlow, 1881, p. 56; P. B.-A., No. 572. Fronds short, coarse, 

 dull green, 60-100 ^ diam., matted, procumbent, with patent, 

 flexuous branches, bearing a few irregularly placed, curved 

 ramuli; cells 2-4 diam. long. R. I. and Conn. Europe. 



A coarse, unsightly plant, creeping in tangled masses among 

 other algae in the litoral zone, in late autumn and winter. Not 



