128 FRESH-WATER ALG^E OF THE UNITED STATES. 



/. Var. CLAVATA, Wolle. 



Bright vegetative green, sparingly branched, articulations 

 with ends usually rounded and swollen ; below about 100 /*, 

 smaller branches 50 j* diameter ; 5-8 times as long as broad. 

 Mountain stream, Colorado. 



g. Var. PUMILA, Bail. 



Barely one inch long, corymbose-fasciculate, erect ; dark 

 green (pale subglaucous green, Kab. ) membrane firm. 



In clusters on stones or wood at water-falls, frequent. 



Plate CX, figs. 1, 2, C. glomerata, an ultimate branch of a 

 robust form from Florida, (magnified 125 diameters,) zoo 

 gonidia escaping; fig. 3, fasciculate branch of (g} var. 

 pumila; figs. 4-8, apparently young growths from nostoc- 

 like cysts found with (g) var. pumila. 



Plate CXI, figs. 1, 2, parts of filaments of C. canalicularis, 

 Genesee Eiver; figs. 3, 4, (/) var. clavata.; fig. 5, (c) var. 

 rivularis. 



Plate CXII, figs. 1, 2, 3, 4, (d) var. simplicior. 



Diameter of cells from base to apices, 125-25-15 ,w. 

 Ponds, near New York City. 



CLADOPHORA FLUITANS, Kg. 



Filaments elongated, forms clusters one to two feet and 

 upward in length, rather sparingly branched, dark green 

 color. Articulations of the branches proportionately longer 

 than those of the stems. Primary branches furnished with 

 short, 2-6 celled, erect branchlets; cells cylindrical, with 

 thick membrane; those of stems 11-2 times, and of the 

 branches 3-12 times longer than broad ; otherwise like C. 

 glomerate. 



Diameter of stems, 120-135 ^. 

 Diameter of branches, 43-86 yw. 



Found in Watkin's Glen, three feet long. 



CLADOPHORA FLAYESCENS, Ag. 



Pale yellowish, about six inches long, very much branched, 

 fasciculate in a plumose manner, branches patent or in- 

 curved ; cell membrane often distinctly plicate ; cell contents 

 distributed in a reticulate manner. 



Diameter of branches, 70-80 ^ ; articulations 6-12 times 

 as long as wide. 



