COJsFEKVACE^. 83 



18. Cladophora diffusa (?) ; filaments capillary, elongate, loosely tufted, somewhat 

 rigid, full green, flexuous, much branched ; branches distant, irregularly subdivided, 

 nearly naked, or furnished toward the ends with a few short secund ramuli ; articula- 

 tions 3-4 times as long as broad. Harv. Phyc. Brit. t. 130 (?) &c. 



Hab. New York Sound, Messrs. Walters, Pike, c^c. California, Mr. A. D. Frye. 

 (v. s.) 



Tufts loose. Filaments 6-12 inches long or more, generally so rigid as not to col- 

 lapse when removed from the water, capillary or somewhat more robust, much and 

 irregularly branched. Branches distant, often an inch or more apart, erecto-patent, 

 naked in the lower portion or very sparingly ramulose, and sometimes naked throughout 

 and little subdivided. Generally, however, the upper divisions are more repeatedly and 

 more closely branched, and their branches furnished with a few short, secund, pectinate 

 ramuli. On some specimens these are very few and confined to the apices ; on others 

 they are more abundant. 



Recognised chiefly by its naked and distant branches, nearly destitute of ramuli. 

 The more ramulose specimens seem gradually to glide ofi" into C. Icetevirens. I quote 

 the figure in Phyc. Brit, with a mark of doubt, and refrain from quoting other authori- 

 ties, because I am not quite sure of the specific identity of the American and European 

 specimens. 



Sect. 2. Species found in brackish water, or in fresh-water ponds and streams. 



19. Cladophora fracta, Fl. Dan. ; tufts irregular, entangled, often detached and 

 then forming floating strata, dull green ; filaments rather rigid, distantly branched, the 

 lesser branches somewhat dichotomous, spreading, with very wide axils ; the ramuli 

 few, alternate or secund ; articulations 3-6 times as long as broad, at first cylindrical, 

 then elliptical, with contracted nodes. Fl. Dan. t. 946. Dillw. Conf. t. \A. E. Bot. 

 t. 2338. Lyngb. Hyd. Dan. t. 52. Harv. Phyc. Brit. t. 294. Kutz. Sp. Alg. 

 p. 410. 



Hab. In salt water ditches and ponds, also in brackish or fresh water. Ehode 

 Island, and in the Hudson, at West Point, Prof. Bailey. Beesley's Point, Mr. Ash- 

 mead. Near New York, Mr. Walters, (v. v.) 



This is at first tufted and attached to sticks or stones, but afterwards occurs floating, 

 and then forms strata of considerable extent. Filaments capillary, several inches long, 

 loosely tufted or bundled together, much but distantly branched, the branches widely 

 spreading at very obtuse angles, and again and again dividing, all the minor divisions 

 being equally patent, and the angles equally wide. The lesser branches sometimes bear 

 a few secund ramuli, and are sometimes quite naked. Colour, at first a grass green, but 

 gradually becoming darker. Substance, membranaceous and rather rigid, seldom quite 

 adhering to paper in drying, and readily detached. 



