76 Minnesota Algae 



Island. June 1901. Central America. Forming a dirty green, somewhat 

 firm mass, looking much like a fresh-water sponge. Lake Atitlan and 

 Amatitlan, Guatemala. 1905-1906. (Meek). 



149. Oscillatoria angustissima W. and G. S. West. Welwitsch's African 



Freshwater Algae. Journ. of Bot. 300. 1897. Da Toni. Syll. Algar. 

 5: 171. 1907. 



West. West Indian Freshwater Algae. Journ. of Bot. 42:293. 1904. 

 Buchanan. Notes on the Algae of Iowa; Proc. Iowa Acad. Sci. 14: 14. 1908. 



Plant mass expanded, blue-green; trichomes .6 mic. in diameter, not 

 constricted at joints, flexible, elongate, entangled; apex of trichome neither 

 tapering nor capitate; cells .9-1.2 mic. long; transverse walls not distinct; 

 cell contents homogeneous, light blue-green. 



Iowa. In pond with other algae. Ontario. (Buchanan). West Indies. 

 Bay Estate, Barbados. (Howard). 



150. Oscillatoria splendida Greville. Flora Edinensis. 305. 1824. Gomont. 



Monogr. Oscill. 244. pi. 7. f. 7, 8. 1893. De Toni. Syll. Algar. 5: 



173. 1907. 

 Wolle. Fresh Water Algae. II. Bull. Torr. Bot. Club. 6: 138. 1877. (O. 

 g r a c i 1 1 i m a Kg.) ; Fresh Water Algae. III. 1. c. 6: 183. 1877; (O. 1 e p t o- 

 t r i c h i a Kg.) ; Fresh- Water Algae. U. S. 311. pi. 206. f. 7. 1887. Bennett. 

 Plants of Rhode Island. 115. 1888. Wolle and Martindale. Algae. Brit- 

 ton's Catalogue of Plants found in New Jersey. Geol. Surv. N. J. 2: 609. 1889. 

 Saunders. Protophyta-Phycophyta. Flora of Nebraska. 20. 1894. Collins, 

 Holden and Setcbell. Phyc. Bor.-Am. Fasc. 7. no. 305. 1897. Setchell and 

 Gardner. Algae of Northwestern America. Univ. Calif. Pub. Bot. i: 184. 



1903. Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 24. no. 1161. 



1904. Collins. Phycological Notes of the late Isaac Holden. — II. Rho- 

 dora. 7: 236. 1905. 



Plate IV. fig. 23-25. 



Trichomes 2-3 mic. in diameter, scattered or collected in a thin mass, 

 straight or somewhat flexuous, elongate, not constricted at the joints; apex 

 of trichome gradually tapering, flexuous, capitate; apical cell inflated above; 

 calyptra none; cells 3-9 mic. in length; transverse walls marked by a few 

 protoplasmic granules; cell contents homogeneous, blue-green. 



Rhode Island. Providence. (Bennett). Connecticut. On submerged 



leaves in quiet water. September 1895; in a still pool with decaying vegetable 

 matter, bed of Pequonnock River, August, September, November. (Holden). 

 New Jersey. On small freshwater ponds; in ditches of brackish water. 

 (Wolle). Nebraska. On basin of artesian well (salt). Lincoln. (Saun- 

 ders). Washington. On mud in fresh water pools. Seattle. (Gardner). 

 California. In a small stream near Berkeley. September 1901. (Gardner). 

 Hawaii. On sides of wet rocks. Laupahoehoe, Island of Hawaii. July 1900. 

 (Tilden). 



Var. uncinata Setchell and Gardner. Algae of Northwestern America. 

 Univ. Calif. Pub. Bot. i : 184, pi. 19. f. 22-24. 1903. De Toni. Syll. Algar. 175. 

 1907. 



