CONFERVA. 141 



stricted at the joints. After division only one-half or one- 

 third as long. 



Diameter, 16-17yw. 



Syn. Conferva ventricosa, Kg. 



Pools of stagnant water. 



Plate CXX, figs. 14-16, filaments in ordinary condition 

 before cell division. 



CONFERVA FONTINALIS, Berk. 



Bright green, attached ; articulation 6-10 times as long as 

 the diameter, slightly swollen, or moderately constricted at 

 the joints; starch grannies single, scattered or seriate; cell 

 membrane rather thick, homogeneous. 



Diameter of filaments, 15-18 yw. 



Hitherto only from fresh water ponds and lakes, Florida. 

 Plate CXX, figs. 17-20, a usual condition. 



CONFERVA FUGACISSIMA, Eoth. 



Bather pale or yellowish green ; cells 4-5 times longer than 

 broad, before division ; and 2-2 2 times as long after divi- 

 sion ; not constricted at the joints. Often in large masses; 

 filaments three or more feet in length, rather tenacious. 

 Diameter of filaments, 10-12 yu. 



Quite fresh waters, Florida and northward. 



Plate CXX, figs. 31-33. 



Var. SALINA, Wolle. 



Another very common form from Florida, in brackish 

 waters ; is similar in its growth, and features, rather darker 

 green, somewhat thicker, diameter, 12-14 //, cells average 

 2-3 diameters, appears nearly related to the typical form, 

 hence recognize it as a variety. 



* 



CONFERVA AFFINIS, Kg. 



Pale or yellowish green. Cells prior to division often 

 seven times as long as the diameter, later three to four times 

 as long ; slightly constricted at joints ; cell walls rather in- 

 distinctly striate. 



Diameter of filaments, 6-11 //. 



Syn. Conferva subtilis, Kg. 

 Plate CXX, figs. 11-13. 



Stagnant and sluggish water. 



