THE GREEN ALGAE OF NORTH AMERICA m 



broad, sometimes straight and parallel, sometimes making a 

 single turn in the cell ; fertile cells little or not at all swollen ; 

 spores ellipsoid with tapering ends, yellowish at maturity, 1)2-2 

 diam. long, diam. 60-72 /u. Mass., Conn., N. J., Iowa, Cuba. 



Europe, Africa. 



Forms dark green, very mucilaginous masses ; filaments crisp 

 and shining, when taken from the water. 6\ diluta Wood, 

 1872, p. 170, PI. XV, fig. 2, should probably be included in this 

 species. 



12. S. JUGAUS (Fl. Dan.) Kiitzing, 1845, p. 223; Petit, 

 1880, p. 28, PI. XI, figs. 3 and 4; Wolle, 1887, p. 219, PI. 

 CXXXVIII, figs. 7 and 8 ; Rabenhorst, Algen, No. 1049. 

 Filaments 90-100 p. diam. at the nodes, cells i-i : j diam. long, 

 usually swollen near the middle and there reaching 115 fj. diam., 

 chromatophores 3 or 4, quite broad, pale green, finely dentate, 

 with many large pyrenoids, and making 1-2 turns in the cell ; 

 fertile cells of the same form ; spores ovoid, brown at maturity, 

 \Y-z diam. long, diam. IOO-IIO/A. Mass. Europe. 



Not uncommon, forming dense masses of a handsome green, 

 hardly at all mucilaginous ; filaments firm and crisped, large 

 enough to be visible singly. The swollen vegetative cells give 

 the most striking character. 



13. S. SETIFORMIS (Roth) Kiitzing, 1845, P- 22 3 : Petit, 

 1880, p. 29, PI. XI, figs, i & 2; Wolle, 1887, p. 219, PL 

 CXXXVIII, figs. 1-4; Wittr. & Nordst., Alg. Exsicc., No. 

 747. Filaments 100-1 10 p. diam., cells about as long as broad, 

 sometimes nearly 2 diam. long; 4 rather broad chromatophores, 

 irregular, with sinuate margins and many large pyrenoids, 

 making *4-i turn in the cell; fertile cells not swollen; spores 

 ellipsoid, diam. 96-100 /u,. Mass., Pa., N. J. Europe. 



Quite near .5T. jugaiis, but without the swollen vegetative 

 cells, with narrower and more irregular spirals, and somewhat 

 smaller spore. 



14. S. PARVISPORA Wood, 1869, p. 139; 1872, p. 169, PL 

 XV, fig. 7 ; Wolle, 1887, p. 221, PL CXL, figs. 8 & 9. Fila- 

 ments about 75 /A diam., cells 2-4 diam. long; chromatophores 

 4, narrow, making i 1 ,- turns in the cell; fertile cells not 

 swollen; spores ellipsoid, about 1^2-2 diam. long, diam. about 

 50^.. Florida. 



Quite distinct by the small size of the spores in proportion to 

 the cells. There appears to be no record of it but the original 

 description. 



