192 Minnesota Algae 



stricted in the center, with round-truncate apices, contiguous to the 

 heterocysts or remote from them, developed centrifugally, usually in 

 catenate series; wall of gonidium smooth, pale smoke-colored. 



Alaska. Floating on shallow ponds or sluggish streams. Huntville, 

 Unalaska. (Setchell and Lawson). Glacier Valley, Unalaska. (Lawson). 

 Maine. In a ditch just above the beach. Eagle Island, Penobscot Bay. July 

 1896. (Collins). Massachusetts. On dead leaves, in swamp near Bear's 

 Den Path, Middlesex Fells; Penny Brook, Lynn Woods, July 1905. (Col- 

 lins). Nebraska. In moist places in greenhouses. (Bessey, Saunders). 

 Washington. Near Coupeville, Whidbey Island; Green Lake, Seattle. (Gard- 

 ner). Hawaii. In stagnant water. Kauai. July igoo. (Tilden). 



Var. americana Collins. New Cyanophyceae. Erythea. 4: 119. 1896. Col- 

 lins, Holden and Setchell. Phyc. Bor.-Am. Ease. g. no. 207. 1896. Collins. 

 Notes on Algae. — I. Rhodora. i: 10. 1899. De Toni. 1. c. 448. 



Gonidia 30-60 mic. in length, strictly cylindrical. 



Massachusetts. In company with other algae, forming a scum in pools 

 and ditches. Middlesex Eells. June 1893. (Collins). 



354. Anabaena laxa (Rabenhorst) A. Braun in Bornet and Flahault. Note 



sur le Genre Aulosira. Bull. Soc. Bot. de France. 32: 120. pi. 4. f. 

 2, 3. 1885; Revis. des Nostoc. Ann. Sci. Nat. Bot. VII. 7: 233. 1888. 

 De Toni. Syll. Algar. 5: 451. 1907. 

 Collins, Holden and Setchell. Phyc. Bor.-Am. Ease. 30. no. 1454. 1908. 



Plate IX. fig. 18. 



Sheaths colorless, scarcely conspicuous; filaments 7 mic. in diameter; 

 trichomes 4.2-6 mic. in diameter; cells barrel-shaped, about as long as 

 broad; gonidia 6 mic. in diameter, 14-20 mic. in length, cylindrical, with 

 rotund apices; wall of gonidium smooth, colorless. 



Massachusetts. Penny Brook, Lynn Woods. July 1905. (Collins). 



355. Anabaena torulosa (Carmichael) Lagerheim. Bidrag till Sveriges 



Algflora. Oefversigt af K. Vet.-Akad. Forhandl. 47. 1883. Bornet 

 and Flahault. Revis. des Nostoc. Ann. Sci. Nat. Bot. VII. 7: 236. 

 1888. De Toni. Syll. Algar. 5: 455. 1907. 

 Wood. Contr. Hist. Fresh-Water Algae North America. 42. pi., 3. f. 

 3. 1872. (Dolichospermum polysperma (Kg.) Wood). Far- 

 low. Marine Algae United States. Proc. Am. Acad. Arts Sci. 10: 380. 1875. 

 (Sphaerozyga carmichaelii Harv.) ; Report of the U. S. Fish 

 Commission for 1875. 715. 1876; Marine Algae of New England. 30. pi. 

 I. f. 3. 1881. Pike. Check List of Marine Algae. Bull. Torr. Bot. Club. 

 13: 105. 1886. Wolle. Fresh-Water Algae U. S. 289. pi. 198. f. 37, 38. 

 1887. (Sphaerozyga polysperma Rab.). Collins. Algae from 

 Atlantic City, N. J. Bull. Torr. Bot. Club. 15: 310. 1888; Algae of Middlesex 

 County. 14. 1888; Marine Algae of Nantucket. 4. 1888. Martindale. Marine 

 Algae of the New Jersey Coast and Adjacent Waters of Staten Island. 

 Mem. Torr. Bot. Club, i : 92. 1889. Wolle and Martindale. Algae. Brit- 

 ton's Catalogue of Plants found in New Jersey. Geol. Surv. N. J. 2: 607. 1889. 

 Saunders. Protophyta-Phycophyta. Flora of Nebraska. 18. pi. i. f. 8. 1894. 



