176 Minnesota Algae 



New Hampshire. Mixed with other algae. The "Flume,'' Shelburne, 

 Lake Willoughby. (Farlow). Nebraska. On pots in greenhouse. Lincoln. 

 (Bessey). 



330. Nostoc microscopicum Carmichael. Harvey in Hooker's British Flora. 



5: 399. 1833. Bornet and Flahault. Revis. des Nostoc. Ann. Sci. 



Nat. Bot. VIL 7: 210. 1888. De Toni. Syll. Algar. 5: 413. 1907. 

 . Harvey. Nereis Boreali-Americana. Part IIL 115. 1858. Dickie. Notes 

 on a Collection of Algae procured in Cumberland Sound by Mr. James 

 Taylor. Journ. Linn. Sec. Bot. 9: 241. 1867. Farlow. Notes on the Cryp- 

 togamic Flora of the White Mountains. Appalachia. 3: 236. 1883. (N. 

 rupestre Kg.). Harvey. The Fresh-Water Algae of Maine. L Bull. 

 Torr. Bot. Club. 15: 161. 1888. Bennett. Plants of Rhode Island. 114. 

 1888. WoUe and Martindale. Algae. Britton's Catalogue of Plants found 

 in New Jersey. Geol. Surv. N. J. 2: 606. 1889. Collins, Holden and Setch- 

 ell. Phyc. Bor.-Am. Fasc. 6. no. 256. 1897. Collins. The Algae of Jamaica. 

 Proc. Am. Acad. Arts Sci. 37: 240. 1901. Collins, Holden and Setchell. 

 Phyc. Bor.-Am. Fasc. 23. no. 1109. 1903. Setchell and Gardner. Algae of 

 Northwestern America. Univ. Calif. Pub. Bot. i: 191. 1903. Collins. Algae 

 of the Flume. Rhodora. 6: 230. 1904. West. West Indian Freshwater 

 Algae. Journ. of Bot. 42: 291. 1904. Collins. Phycological Notes of the 

 late Isaac Holden. — II. Rhodora. 7: 236. 1905. 



Plate VIII. fig. 5- 



Colonies spherical or oblong, rarely beyond i cm. in diameter, soft, 

 at first glistening, finally becoming olive or brownish; filaments loosely 

 entangled; sheaths more or less distinct, yellowish, "contrasting with the 

 generally uncolored jelly" (Cooke); trichomes S-8 mic. in diameter; cells 

 somewhat spherical; heterocysts 7 mic. in diameter, somewhat spherical; 

 gonidia 6-7 mic. in diameter, 9-15 mic. in length, oval, olive; wall of go- 

 nidium smooth; cell contents sky blue or violet-green. 



Canada. On stones in a small stream. Baffin's Bay. (Sutherland). Cum- 

 berland Sound. (Taylor). Maine. In a lake near Houlton. (Harvey). 

 New Hampshire. On rocks. The "Flume." (Farlow). Vermont. On wet 

 rocks. Ripton Gorge. September 1896. (Farlow). Massachusetts. On 

 pebbles in rather shallow water. Suntaug Lake, Peabody. September 1892. 

 (Collins). Rhode Island. Providence. (Bennett). Connecticut. Sage's 

 Ravine, Salisbury, below First Falls. October. (Holden). New Jersey. 

 Frequent on moist rocks. (WoUe). Washington. Floating, intermingled 

 with other algae. Whidbey Island; Seattle. (Gardner). West Indies. 

 On steps into reservoir. Constant Spring. April 1893. (Humphrey). "Chan- 

 cery Lane Estate," Barbados. (Howard). 



331. Nostoc sphaeroides Kuetzing. Tab. Phyc. 2: 2. pi. 4. f. i. 1850. Bornet 



and Flahault. Revis. des Nostoc. Ann. Sci. Nat. Bot. VII 7: 212. 



1888. De Toni. Syll. Algar. 5: 415. 1907. 



Hall. List 04 the Marine Algae growing in Long Island Sound within 



20 miles of New Haven. Bull. Torr. Bot. Club. 6: 112. 1876. Collins. 



Algae of Middlesex County. 14. 1888. Collins, Holden and Setchell. Phyc. 



Bor.-Am. Fasc. 10. no. 454. 1898. Saunders. The Algae. Harriman Alaska 



