124 Rhodora [J UNE 



C. fracta forma marina Hauck. 



Hauck, Deutsch. Meeresalg., p. 461, excluding synonymy. 



Hauck & Richter, Phyc. Univ., No. 68. 



C. fracta Harvey, Phyc. Brit., PI. CCXCIV; Nereis Bor.-Am., 

 part 3, p. 83, as to marine forms. 



Le Jolis, Alg. Mar. Cherb., p. 59. 



Farlow, N. E. Marine Algae, p. 56; not of list of algae of South- 

 ern N. E. 



Tufts irregular, dull green; filaments somewhat stiff, 80-120 /x 

 diam., sparingly and somewhat dichotomously divided; branches 

 spreading, angularly bent, with few and irregular quite blunt ramuli ; 

 articulations usually 3-6 diam. 



C. fracta is an abundant and very variable species in fresh water, 

 the world over, but occurs only occasionally in salt water, and may 

 perhaps be considered less a true marine plant than as a stray form, 

 out of its normal element. Still it does occur in submarine and 

 even distinctly marine stations on many coasts, and must have a 

 place in any marine list. Its nearest ally is C. cxf>ansa, a more 

 freely and regularly branched plant; characteristic forms can readily 

 be distinguished, but there are many forms, especially old and 

 worn individuals, where the line is hard to draw. Indeed, old and 

 battered specimens of any species of Cladophora make fairly good 

 C. fracta. 



C. fracta forma flavescens (Harv.). 



C.flavescens Harvey, Phyc. Brit., PI. CCXCVIII. 



Filaments more slender than in the type, usually 30-60 /x diam.; 

 articulations 6-10 diameters, ultimate ramuli tapering but with blunt 

 tips; forming dense floating masses in high, warm pools. 



Marblehead, Mass. ; Rockaway, Long Island, N. Y. 



C. Magdalenae Harv. 



Harvey, Phyc. Brit., PI. CCCLV, A. 



Le Jolis, Alg. Mar. Cherb., p. 59. 



Farlow, N. E. Marine Algae, p. 56. 



De Toni, Syll. Alg., Vol. I, p. 325. 



Collins, Holden cS: Setchell, Phyc. Bor.-Am., No. 572. 



Fronds short, coarse, dull green, matted, procumbent, with patent, 

 flexuous branches, which have a few irregularly arranged, curving 

 ramuli ; filaments 60-100 fi diam., articulations 2-4 diam. 



In some respects seeming like a form of C. fracta, but apparently 

 as distinct as can be ordinarily expected of a Cladophora. It grows 

 among other algae between tide marks, creeping in entangled masses. 

 It has been found only in two localities ; Napatree Point, R. I., 



D. C. Eaton ; Milford, Conn., Isaac Holden. 

 C. refracta (Roth) Areschoug. 



Areschoug, Alg. Exsicc. Scand., No. 338; not Phyc. Brit., PL 

 XXIV nor De Toni, Syll. Alg., Vol. I, p. 324. 



