Myxophyceae 79 



California. Floating in warm salt water from a power house. Oakland. 

 October 1905, June 1906. (Gardner). 



156. Oscillatoria animalis Agardh. Aufzahlung, etc. Flora. 10: 632. 1827. 



Gomont. Monogr. Oscill. 247. 1893. De Toni. Syll. Algar. 5: 178. 

 1907. 

 Maze and Schramm. Essai Class. Algues Guadeloupe. 16. 1870-1877. 

 (O. t h e r m a 1 i s Crouan). 



Plate IV. fig. 30. 



Plant mass blue-green; trichomes 3-4 mic. in diameter, straight, fragile, 

 not constricted at the joints; apex of trichome briefly tapering, sharply 

 pointed, hooked or twisted, not capitate; apical cell mucronate; calyptra 

 none; cells 1.6-5 mic. in length; transverse walls here and there granulated; 

 protoplasmic contents finely granular. 



North America, (Farlow). West Indies. Guadeloupe. (Maze and 

 Schramm). 



157. Oscillatoria violacea (Wallroth) Hassall. British Freshwater Algae. 



254. pi. 72. f. 10. 184s. De Toni. Syll. Algar. 5: 179. 1907. 

 WoUe. Fresh Water Algae. III. Bull. Torr. Bot. Club. 6: 182. 1877; 

 Fresh-Water Algae U. S. 311. pi. 206. f. 10. 1887. Bennett. Plants of 

 Rhode Island. 115. 1888. Bessey. Miscellaneous Additions to the Flora 

 of the State, and new or noteworthy species from various localities. Bot. 

 Surv. Nebraska. 46. 1893. Saunders. Protophyta-Phycophyta. Flora of 

 Nebraska. 21. 1894. 



Plate IV. fig. 31- 



Plant mass membranaceous, dull green or lead-colored; trichomes 4-4.S 

 mic. in diameter, straight, narrow, tangled; apical cell drawn out to a thin 

 point; cells shorter than the diameter of trichome; transverse walls granu- 

 lated; cell contents finely granular, violet or sky-blue in color. 



Rhode Island. Common. (Bennett). Pennsylvania. Most frequent in 

 greenhouses. (Wolle). Nebraska. In greenhouse at University. Lincoln. 

 (Bessey, Saunders). 



158. Oscillatoria brevis Kuetzing. Phyc. Gen. 186. 1843. Gomont. Monogr. 



Oscill. 249. pi. 7. f. 14, IS- 1893. De Toni. Syll. Algar. 5: 180. 1907. 

 Wolle. Fresh Water Algae. II. Bull. Torr. Bot. Club. 6: 138. 1877; Fresh- 

 Water Algae. U. S. 312. pi. 207. f. 8. 1887. Wolle and Martindale. Algae. 

 Britton's Catalogue of Plants found in New Jersey. Geol. Surv. N. J. 2: 

 609. 1889. Tilden. American Algae. Cent. I. no. "jy. 1894; List of Fresh- 

 Water Algae collected in Minnesota during 1894. Minn. Bot. Studies, i: 

 23s. 189s; American Algae. Century VI. no. 597. 1902. Collins, Holden 

 and Setchell. Phyc. Bor.-Am. Fasc. 24. no. 1158. 1904. West. West Indian 

 Freshwater Algae. Journ. of Bot. 42: 292. 1904. (Also O. subb'revis 

 Schmidle?). 



Plate IV. fig. 32. 



Plant mass olive green; trichomes 4-6.5 mic. in diameter, scattered or 

 in masses, especially straight, fragile, not constricted at joints; here and 



