Myxophyceae 195 



357- Anabaena bornetiana Collins. New Cyanophyceae. Erythea. 4: 120. 

 1896; in Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 5. no. 

 208. 1896. De Toni. Syll. Algar. 5: 457. 1907. 



Trichomes 12 mic. in diameter, straight or somewhat flexuous; cells 

 spherical or slightly shorter than their diameter; heterocysts 13-14 mic. 

 in diameter, 13-20 mic. in length, spherical or occasionally oblong; go- 

 nidia 15-20 mic. in diameter, 50-90 mic. in length, cylindrical or more com- 

 monly tapering slightly from the middle to the rounded ends, contiguous 

 to heterocysts on each side; wall of gonidium smooth, translucent. 



Massachusetts. Occurring usually in isolated filaments among other al- 

 gae in ditches and pools, often with other species of Anabaena. Maiden, 

 Medford, Middlesex Fells. May, June 1896. (Collins). 



358. Anabaena azoUae Strasburger. Das Botanische Practicum. 352. f. 124. 



1884. De Toni. Syll. Algar. 5: 457. 1907. 



Tilden. American Algae. Cent. II. no. 170. 1896; List of Fresh-Water 

 Algae collected in Minnesota during 1896 and 1897. Minn. Bot. Studies. 

 2: 27. 1898. Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 16. no. 

 754. 1900. 



Sheaths not present; trichomes snake-like in shape, aggregated in 

 small bundles; cells 5 mic. in diameter, 8 mic. in length, usually somewhat 

 spherical or ellipsoidal, cylindrical, with rotund apices; heterocysts up to 

 10 mic. in diameter, oval, easily distinguished from the olive contents and 

 polar nodules ("cellulose buttons"); cell contents lead-colored-green; go- 

 nidia unknown. 



Minnesota. In chambers in the leaves of Azolla Carolinian a. 

 University Plant House, Minneapolis. September 1896. (Tilden). Cali- 

 fornia. Endophytic in Azolla Carolinian a, growing in pools in the 

 bed of Los Angeles River, Los Angeles. November 1900. (Monks). 



359. Anabaena confervoides Reinsch. On Fresh-Water Algae from Ker- 



guelen's Island. Journ. Linn. Soc. Bot. 15: 208. 1877. De Toni. 

 Syll. Algar. 5: 461. 1907. 

 Tilden. American Algae. Cent. V. no. 482. 1901; Collection of Algae 

 from the Hawaiian Islands. Hawaiian Almanac and Annual for 1902. 112. 

 1901. 



Plate IX. fig. 21. 



Plant mass thin; trichomes 2.2-2.8 mic. in diameter, slender, extremely 

 long, very straight, parallel, surrounded by a common mucus; cells very 

 distinct, rectangular, slightly longer than broad; heterocysts a little larger 

 than the cells, elliptical; cell contents finally granular, pale blue-green; 

 gonidia unknown. 



Hawaii. Floating at edge of taro patch. Near Hauula Courthouse, 

 Hauula, Koolauloa, Oahu. June 1900. (Tilden). 



360. Anabaena cupressophila Wolle. Fresh-Water Algae U. S. 288. pi. 198. 



f. I, 2. 1887. De Toni. Syll. Algar. 5: 458. I907- 

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



