Myxophyceae 191 



Rhode Island. Providence. (Lathrop). R. W. Park. (Bennett). New 

 York. Chautauqua Lake. (Wolle). Pennsylvania. Floating upon a brick 

 pond, forming a part of a thick, dirty green, "pea-soup" colored, almost 

 pulverulent scum. (Wood). District of Columbia. Washington. (Moore 

 and Kellerman). Minnesota. Lake Tetonka, Waterville. 1882. (Arthur). 

 Floating on a pond. Union Park, Minneapolis. August 1882. (Butler). 

 Floating in large quantities at edge of lake. Lake Calhoun, Hennepin 

 County. October 1894. (Tilden). Spring Park, Lake Minnetonka. October 

 1901. (Nelson). Iowa. Very common in the lakes. East Okoboji Lake; 

 Upper Gar Lake. October 1904. (Buchanan). Nebraska. Gives a bluish 

 green color to stagnant water, or in age forms a blue-green scum on the 

 surface. (Saunders). 



352. Anabaena inaequalis (Kuetzing) Bornet and Flahault. Revis. des 



Nostoc. Ann. Sci. Nat. Bot. VIL 7: 231. 1888. De Toni. Syll. Algar. 

 5: 446. 1907. 



Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 24. no. 1165. 1904. 



Plate IX. fig. 16. 



Plant mass floccose, floating or climbing to other algae, blue-green; 

 sheaths distinct, especially around the gonidia; trichomes 4-5 mic. in diame- 

 ter, straight, parallel, sometimes free, sometimes surrounded by a firm 

 mucus; apex of trichome scarcely tapering; apical cell obtuse; cells spheri- 

 cal-truncate; heterocysts 6 mic. in diameter, spherical; gonidia 6-8 mic. in 

 diameter, 14-17 mic. in length, remote from the heterocysts, developed 

 centrifugally, two or three in a series; wall of gonidium smooth, yellowish. 



California. Lake Chabot, San Leandro. June 1902. (Osterhout and 

 Gardner). 



353. Anabaena catenula (Kuetzing) Bornet and Flahault. Revis. des Nos- 



toc. Ann. Sci. Nat. Bot. VII. 7: 232. 1888. De Toni. Syll. Algar. 



5. 447. 1907. 

 Wolle. Fresh- Water Algae U. S. 290. pi. 199. f. 17-24. 1887. (S p h a e r o- 

 zyga smithii (Thw.) Wolle). Bessey. Miscellaneous Additions to 

 the Flora of the State. Bot. Surv. Nebraska. 46. 1893. Saunders. Proto- 

 phyta-Phycophyta. Flora of Nebraska. 18. pi. i. f. 9, 10. 1894. Collins. 

 Algae. Flora of the Blue Hills, Middlesex Fells, Stony Brook and Beaver 

 Brook Reservations of the Metropolitan Park Commission, Massachusetts. 

 128. 1896. Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 11. no. 

 S06. 1898. Collins. Notes on Algae.— I. Rhodora. i: 10. 1899. Setchell 

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

 192. 1903. 



Plate IX. fig. 17- 



Plant mass gelatinous, floating, blue-green; sheaths difiluent in mature 

 plants; trichomes 5-8 mic. in diameter, flexuous; apical cell rotund; cells 

 barrel-shaped, usually a little shorter than the diameter; heterocysts 6-9 

 mic. in diameter, 9-13 mic. in length, somewhat spherical or oblong; gonidia 

 --10 mic. in diameter, 16-30 mic. in length, cylindrical, often slightly con- 



