112 FRESH-WATER ALGJE OF THE UNITED STATES. 



Syn. Draparnaldia elongata, Hass. 



Plate XCVI, fig. 1, a single well -formed plant ; figs. 2, 3, 

 parts of filament producing series of microzoospore-bear- 

 ing cells ; figs. 4-6, microzoospores passing from the spor- 

 angia and developing. 



STIGEOCLONIUM NANUM, (Dillw.) Kg. 



Filaments alternately branched, branches abbreviated, 

 somewhat attenuated upward, ends obtuse, not piliferous ; 

 cells equal or a little longer or shorter than their diameter. 

 Ordinarily very short, only 2-3 mm long. 



Diameter of cells, 6-8 //. 



Forming a thin, slippery coating on stones in streams. 



Syn. Draparnaldia nana, Hass. ; Conferva nana, Dillw. 

 Plate XCYI, fig. 10. 



STIGEOCLONIUM SUBSECUNDUM, Kg. 



Bright, yellowish green, filaments sparingly branched ; 

 primary and secondary branches attenuated, ending in a 

 short, colorless bristle ; primary branches in most part short, 

 but sometimes elongated ; basal articulations 6-8 times 

 longer than wide, in upper part 2-4 times longer. 



Diameter of filaments, 11-20 jw. 



Collected by H. W. Ravenel, in rice-field ditches, South 

 Carolina. 



Plate XCIX, fig. 2, a single filament. 



STIGEOCLONIUM PROTENSUM, (Dillw.) Kg. 



Pale green, caespitose, slender ; filaments and branches 

 long drawn out ; cells nearly cylindrical, equal or twice as 

 long as broad, terminal cells extended into a colorless some- 

 what tapering bristle ; branches usually scattered, rarely in 

 pairs. 



Diameter of cells of filaments, 12-16 /*. 



Syn. Draparnaldia condensata, Hass. ; Conferva protensa, Dillw. 

 Border of lakes, Florida. 



Plate CI, figs. 1, 2, two ordinary filaments ; figs. 3, 4, two 

 long cuspidate ends. 



STIGEOCLONIUM FLAGELLIFERUM, Kg. 



Floccose caespitose, bright yellowish green, half an inch 

 or more in length ; somewhat fasciculately branched, articu- 



