l88 Minnesota Algae 



New Jersey. Fresh water. Somerset. (Setchell). In pools, Bound Brook. 

 (Wolle). Minnesota. In stagnant water in popls made by high waves 

 and seepage on beach. Oatka Beach. Minnesota Point, Duluth. August 

 1901. (Tilden). South Dakota. Artesian water into which sewage runs. 

 Aberdeen. August 1895. (Griffiths). Floating in large light blue-green masses 

 on the surface of a pond supplied with artesian water. September 1898. 

 (Saunders). Montana. Common in open, muddy pools heated by the 

 sun's glare; rising to the surface in small, frothy scummy masses. Ponds 

 and semi-stagnant mud-bottomed parts of streams in the mountains and 

 on the plains. June to November. (Anderson and Kelsey). Wyoming. 

 On surface of water in ditch. Seven miles north of Lake Hotel, Yellowstone 

 National Park. July 1896. (Tilden). Idaho. Standing water. Near Lewis- 

 ton, Nez Perces County. (800 feet). 1896. (A. A. and E. G. Heller). 

 Washington. In ditches and ponds. Whidbey Island; Seattle. (Gardner). 

 California. San Francisco. (Setchell). In masses ofRuppia maritima 

 in salt marsh pool. West Berkeley. August 1904. (Gardner). Hawaii. On 

 bottom of irrigation ditches in sugar cane field. Water turned on about 

 once a week. Ewa Plantation, Oahu. June 1900. (Tilden). Maluhia, Oahu. 

 (Schauinsland). 



348. Anabaena hallensis (Janczewski) Bornet and Flahault. Revis. des Nos- 

 toc. Ann. Sci. Nat. Bot. VII. 7: 227. 1888. De Toni. Syll. Algar. 

 S: 440. 1907. 

 Bessey, Pound and Clements. Additions to the Reported Flora of the 



State. Bot. Surv. Nebraska. 5: 12. 1901. 



Plate IX. fig. 10-13. 



Plant mass mucous, floating; sheaths gelatinous; trichomes 4-5 mic. 

 in diameter, somewhat straight, with tapering apices; c6lls depressed 

 spherical or somewhat quadrate; heterocysts S mic. in diameter, barrel- 

 shaped; gonidia 7-8 mic. in diameter, 10-12 mic. in length, oblong-elliptical, 

 truncate at the apices, usually remote from the heterocysts, developed cen- 

 trifugally; wall of gonidium colorless, minutely papillose; cell contents 

 granular; blue-green. 



Nebraska. In aquaria. Lincoln. (Bessey). 



549. Anabaena sphaerica Bornet and Flahault. Revis. des Nostoc. Ann. 

 Sci. Nat. Bot. VII. 7: 228. 1888. De Toni. Syll. Algar. 5: 440. 1907. 



Setchell and Gardner. Algae of Northwestern America. Univ. Calif. 

 Pub. Bot. i: 192. 1903. 



Plant mass floccose, blue-green; sheaths not distinct; trichomes 5-6 

 mic. in diameter, moniliform, straight, agglutinated together in parallel 

 bundles; cells spherical or spherical-truncate; heterocysts 6-7 mic. in 

 diameter, nearly spherical; gonidia 12 mic. in diameter, 12-18 mic. in length, 

 spherical or somewhat oval, contiguous to heterocysts, in short series; 

 wall of gonidium smooth, brownish yellow. 



Washington. Floating on the surfaces of small ponds. Whidbey Island; 

 Port Townsend. (Gardner). 



Var. macrosperma Bornet and Flahault. 1. c. 228. De Toni. 1. c. 440. 



