184 Minnesota Algae 



hair as long as wide; heterocysts nearly spherical, yellowish; cell contents 

 granular, bright blue-green. 



Colorado. (WoUe). Pennsylvania. (Wolle). Nebraska. In salt 



lake, Lincoln. 



According to some authorities this species may belong to Anabaena 

 cupressaphila or to N. harveyaiia. 



343. Nodularia hawaiiensis Tilden. American Algae. Cent. V. no. 484. 



1901; Collection of Algae from the Hawaiian Islands. Hawaiian 

 Almanac and Annual for 1902. 112. 1901. 



Plate IX. fig. s. 



Plant mass stringy, dark blue-green; sheaths not evident; trichomes 

 7.5-9.5 mic. in diameter; cells before division nearly as long as broad, de- 

 pressed spherical; heterocysts 10 mic. in diameter, spherical or a little 

 longer than broad; gonidia not known. 



Hawaii. In tufts attached to other algae, on reef constantly washed 

 over by waves. Waianae, Oahu. May 1900. (Tilden). 



The filament has neither the distinct sheath and small diameter of that 

 of N. harveyana nor the short Oscillatoria-like cells of N. s p u m i- 

 g e n a, the only marine forms of Nodularia described by Bornet and 

 Flahault. Until gonidia are found in the plant its affinities cannot be dis- 

 covered. 



344. Nodularia armorica Thuret. Notes Algologiques. 2: 122. pi. 29. 1880. 



Bornet and Flahault. Revis. des Nostoc. Ann. Sci. Nat. Bot. VII. 



7: 245. 1888. De Toni. Syll. Algar. 5: 433. 1907. 

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

 Pub. Bot. i: 193. 1903. Collins, Holden and Setchell. Phyc. Bor.-Am. 

 Fasc. 22. no. 1061. 1903. 



Plate IX. fig. 6. 



Filaments lo-ll mic. in diameter, entangled; sheaths very thin; cells 

 compressed, one half as short as the diameter; heterocysts compressed, d 

 little larger than the cells; gonidia 10-12 mic. in diameter, 9 mic. in length, 

 depressed spherical, yellowish brown, arranged in series; end walls of 

 gonidia firm, biconcave, transversely truncate. 



Washington. Floating on the surfaces of quiet ponds. Near Coupeville, 

 Whidbey Island; Port Townsend. (Gardner). California. In a shallow 

 ditch. Oakland. May 1902. (Osterhout and Gardner). 



345. Nodularia spumigena Mertens in Jurgens. Algae Aquaticae. Dec. 



XV. no. 4. 1822. Bornet and Flahault. Revis. des Nostoc. Ann. Sci. 

 Nat. Bot. VII. 7: 245. 1888. De Toni. Syll. Algar. 5: 433. 1907. 



Filaments entangled in a mucous mass, or scattered, sometimes float- 

 ing free, somewhat straight or curled; sheaths sometimes thin, or 

 in other cases quite thick; cells very short, disc-shaped, three or four 

 times shorter than the diameter; heterocysts a little larger than the cells; 



