Myxophyceae 67 



Minnesota. On rocks. Grand Marais, Lake Superior. July 1896. (Elft- 

 man). 



132. Oscillatoria curviceps Agardh. Syst. Alg. 68. 1824. Gomont. Mon- 



ogr. Oscill. 233. pi. 6. f. 14. 1893. De Toni. Syll. Algar. 5: 157. 1907. 

 Maze and Schranun. Essai class. Algues Guadeloupe. 16. 1870-77. (O. 

 subsalsa dulcis). Dame and Collins. Flora of Middlesex County, 

 Massachusetts. 15. 1888. (O. froelichii viridis). Tilden. Ameri- 

 can Algae. Cent. II. no. 189. 1896. Bessey, Pound and Clements. Addi- 

 tions to the reported Flora of the State. Bot. Surv. Neb. 5: 13. 1901. 

 Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 27. no. 1305. 1906. 



Plate IV. fig. 7. 



Plant mass light or dark blue-green; trichomes 10-17 mic. in diameter, 

 elongate, straight below, above curved or twisted into a loose spiral, not 

 constricted at joints; apex of trichome not or scarcely tapering, not capi- 

 tate; cells 2-5 mic. in length; outer wall of apical cell convex, sometimes 

 slightly thickened; transverse walls sometimes marked by two rows of 

 granules; cell contents uniformly granular or showing larger granules. 



United States. (Wolle, Farlow). Massachusetts. Medford claypits. 

 (Collins). Nebraska. On moist soil, greenhouse. Lincoln. (Bessey). 

 Colorado. On surface of slow-flowing water in swamp. Five miles south- 

 east of Fort Collins. July 1896. (Cowen). California. Outlet of Lake 

 Temescal, Oakland. July 1905. (Gardner^i. West Indies. (Crouan). 



133. Oscillatoria major Vaucher. Hist. Conferves d'eau douce. 192. pi. 



15. f. 3. 1803. De Toni. Syll. Algar. 5: 157. 1907. 



W'oUe. Fresh Water Algae. II. Bull. Torn Bot. Club. 6: 138. 1877. 

 WoUe and Martindale. Algae. Britton's Catalogue of Plants found in New 

 Jersey. Geol. Surv. N. J. 2: 609. 1889. West. The Freshwater Algae of 

 Maine. Journ. of Bot. 29: 356. 1891. 



Plant mass membranaceous, mucous, blue-green, lead-colored or dark 

 steel-blue; trichomes 18-23 mic. in diameter, straight, often arranged longi- 

 tudinally in narrow bundles; apex of trichome somewhat tapering, ob- 

 tusely rounded, usually straight; cells 4.5-6 mic. in length; transverse walls 

 granulated on both sides. 



Maine. Scarbro'. (Aubert). New Jersey. In sluggish and stagnant 

 waters. (Wolle). Pennsylvania. Borders of ponds and pools. (Wolle). 



134. Oscillatoria ornata Kuetzing. Tab. Phyc. i: 30. pi. 42. f. 9. 1845-1849. 



Gomont. Monogr, Oscill. 234. pi. 6. f. 15. 1893. De Toni. Syll. 

 Algar. s: 158. 1907. 



Plate IV. fig. 8. 



Plant mass dark blue-green; trichomes 9-11 mic. in diameter, slightly 

 constricted at joints, here and there interrupted by inflated and refringent 

 cells, straight below, above twisted into a loose spiral, slightly and grad- 

 ually tapering; apex of trichome not capitate, obtuse; apical cell convex 

 above; calyptra none; cells 2-5 mic. in length; transverse walls frequently 

 granulated. 



