142 FRESH-WATER ALG^S OF THE UNITED STATES. 



CONFERVA FUNKII, Kg. 



Pale or light yellowish green, later of a faded aspect. 

 Cells prior to division about four times as long as wide, 

 later twice as long. 



Diameter of filaments, 6-8 ^. 



From stagnant waters, Colorado. 

 Plate CXX, figs. 9, 10. 



CONFERVA VULGARIS, Eab. 



Bright green, articulations more or less swollen, 2-3 J times 

 as long as wide ; cell contents usually very granular ; cell 

 membrane firm. 



Diameter of filaments, 10-12 /*. 



Var. FARLOWII, Wolle. 



Cells 2-3 times as long as wide. 

 Diameter of filaments, 7-9 yw. 



Syn. Conferva bombycina inaequcdis, Kg. ; Microspora bombycina, 

 Thuret; Microspora vulgaris, Eab. 



Very common in pools, ditches, trenches of running 

 waters, outlet of springs, etc. 



Plate CXXI, figs. 6, 7, the type form; figs. 10, 11, the 

 variety ; fig. 12, microgonidia escaping ; fig. 13, young 

 developing plants. 



CONFERVA BOMBYCINA, Ag. 



Yellowish or darker green, soft, silky ; articulations 

 oblong- cylindrical, slightly constricted at joints ; before 

 division five times as long as the diameter, later about three 

 times as long ; cell -membrane rather thin ; in drying some 

 of the cells collapse, sometimes alternately. Filaments of 

 irregular thickness. 



Diameter, 6-12 yw. 



Syn. Conferva sordida, Dillw. ; vesciculifera bombycina, Jernier. 



Trenches, ponds, pools, etc., not rare. 



Plate CXXI, figs. 8, 9, two vegetative filaments, and one 

 dried, having alternate cells collapsed. 



CONFERVA PUNCTALIS, Dillw. 



Forms dull green mats ; filaments sometimes single or 

 scattered ; cells short, not longer than two diameters before 

 division ; cell contents granular. 

 Diameter, 6-7 yu. 



Generally in stagnant waters. 

 Plate CXXI, figs. 20, 21. 



