THE GREEN ALGAE OF NORTH AMERICA 15 



masses; often with thick, pectose sheath, up to 17 /A thick. 

 Mass., 111. 



46. S. ELLIPSOSPORA Transeau, 1914, p. 294, PI. XXVII, 

 fig. i ; 1915, p. 25. Filaments dark green, lubricous ; veg. cells 

 [25-150 X 125-500/1; dissepiments plane ; chromatophores 3-8, 

 making ^-4 turns; spores ellipsoid with more or less pointed 

 ends, 100-140 X 160-255 /A. Me., Mass., 111., Minn. 



Var. CRASSOIDEA Transeau, 1914, p. 295, PI. XXVII, fig. 2. 

 Cells 140-150 X 140-560 /A; spores compressed ellipsoid, ends 

 broadly rounded in one position, sharply pointed in another, 

 120-140 X H5-255 /" Hi- 

 Differs from the typical form chiefly in the shape of the spore. 



47. S. PRATENSIS Transeau, 1914, p. 292, PI. XXV, figs. 

 12-14; PI- XXVI, figs. 1-2. Forming yellowish green masses; 

 cells 17-20 X 80-240 fj., dissepiments plane ; chromatophores 1-2, 

 making r-8 turns; fertile cells inflated, up to 55 ft ; sterile cells 

 cylindrical, inflated or bullate (up to 90 /K) ; zygospores ovoid, 

 ellipsoid or cylindrical with rounded ends, 24-46 X 50-70 /A, 

 yellow, membrane smooth ; aplanospores similar to zygospores. 

 I'll. 



48. S. PROPIA Transeau, 1915, p. 25. Cells 60-68 X 

 80-150 /A, dissepiments plane; chromatophores 3, making .5-1 

 turn ; fertile cells cylindrical ; spores ellipsoid, 42-60 X 80- 120 p. ; 

 yellow brown, membrane irregularly pitted. 111. 



49. S. NOVAE-ANGLIAE Trauseau, 1915, p. 26. Cells 

 50-60 X 200-350 ft. ; dissepiments plane ; chromatophores 3-5, 

 making 2.5-4.5 turns; fertile cells not inflated; spores ovoid, 

 50-65 X 80-120 /A, yellow, membrane reticulate and densely 

 punctate. Mass., 111. 



50. S. PUNCTIFORMIS Transeau, 1914, p. 294, PI. XXVI, 

 fig. 7. Filaments usually scattered; cells 27-30 X 120-390^1; 

 dissepiments plane : chromatophores 1-2, narrow, making 3-6 

 turns; fertile cells inflated, 44-50^; male cells 90-140 /A long, 

 female cells 100-250 p. long ; occurring singly or in pairs, alter- 

 nating with vegetative cells ; tube usually produced by male 

 cells ; spores ovoid to cylindric-ovoid, 40-48 X 60-110 /A, yellow, 

 membrane punctate. 111. 



51. S. NARCISSANA Transeau, 1914, p. 290, PI. XXV, figs. 

 4-6. Filaments usually scattered; cells 12-14 X 200-400 /A; 

 one chromatophore, slender, making 2-5 turns; dissepiments 

 semi-replicate ; fertile cells much inflated towards the middle, 

 rounded or quadrate in outline, up to 33 /u.diam., not shortened ; 

 zygospores unknown ; aplanospores ellipsoid to ovoid, 23-30 X 

 50 1 20 /A, yellow, membrane smooth. 111. 



