THE GREEN ALGAE OF NORTH AMERICA 301 



10. S. glomeratum (Hazeu) nov. comb.; Myxonema glomer- 

 atum Hazen, 1902, p. 205, PI. XXXIV. Tufts up to i cm. 

 long, with palmelloid base ; branches few below, alternate ; 

 above more frequent, usually alternate, rarely opposite, more or 

 less densely fascicled near the summit, the ramuli tapering to 

 an acute tip or a long seta ; cells of main filaments cylindrical 

 or slightly swollen, 11-14 /*diam., 2-7 diam. long, with broad, 

 zonate chromatophore ; cells of ramuli 6-8 ^ diam., 1-2 diam. 

 long, with dense chromatophore. In pools and fountains. 

 Conn., N. Y. 



11. S. attenuatum (Hazen) nov. comb.; Myxonema atten- 

 uation Hazen, 1902, p. 206, PL XXXV; P. B.-A., No. 1328. 

 Tufted or forming dark green lubricous skeins, up to nearly 

 half a meter long ; dichotomously divided near the base into 

 many filaments, sparingly branched above ; ramuli short, spi- 

 nescent or flagelliform, solitary or 2 or 3 arising from the same 

 point, less often opposite, tapering to an acute tip or a very 

 slender seta; cells cylindrical, 5-7 fj. diam., 2-5 diam. long; 

 chromatophore thin and somewhat broken. Vermont, Mass., 

 Conn. 



Growing in watering troughs, where it has the habit of an 

 Ulothrix rather than of a Stigeoclonium. In the two localities 

 where it has been studied, it was found from Feb. to Nov. 



12. S. stagnatile (Hazen) nov. comb.; Myxonema stagnatile 

 Hazen, 1902, p. 207, PL XXXVI, figs, i and 2. P. B.-A., No. 

 1329. Forming floccose, floating masses; filaments elongate, 

 bearing at long intervals solitary or opposite ramuli ; short, 

 thorn-like, often curved, tapering to a sharp point or a long 

 seta; cells 8-n /u. diam., 1-3 diam. long, occasionally longer ; 

 ramuli 7-9 M diam. at base. Mass., N. Y. 



Always found floating, in company with filamentous algae of 

 various kinds. It is of course probable that it is attached at 

 some early stage, but this has not been observed. 



13. S. SUBSECUNDUM Kiitzing, 1843, p. 253 ; Wolle, 1887, 

 p. 112, PL XCIX, fig. 2?; Myxonema subsecundum Hazen, 

 1902, p. 207, PL XXXVI, fig. 3. Forming loose, pale green 

 or yellowish tufts; filaments elongate, sparingly branched, 12- 

 18, usually 16 ^ diam.; cells 3-10 diam. long ; branches never 

 opposite ; some branches elongate like the main stem, others 

 shorter ; cells 2-3 diam. long ; all branches attenuate towards 

 the apex; cells cylindrical, or dissepiments very slightly con- 

 stricted. In ditches. N. J., So. Carolina, Jamaica. Europe. 



A soft, pale green plant, especially characterized by the 



