230 IVIinnesota Algae 



WoUe. Fresh-Water Algae. VII. Bull. Torr. Bot. Club. 10: 20. 1883. 

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

 Jersey. Geol. Surv. N. J. 2: 605. 1889. West and West. On some Fresh- 

 water Algae from the West Indies. Journ. Linn. Soc. Bot. 30: 271. 1895. 

 Setchell. Notes on Cyanophyceae. — 11. Erythea. 4: 193. 1896. 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. 6. no. 

 257. 1897. Tilden. American Algae. Century IV. no. 397. 1900. Saun- 

 ders. The Algae. Harriman Alaska Expedition. Proc. Wash. Acad. Sci. 

 3: 398. 1901. Setchell and Gardner. Algae of Northwestern America. 



Univ. Calif. Pub. Bot. i: 196. 1903. Tilden. American Algae. Cent. VII. 

 Fasc. I. no. 628. 1909. 



Plant mass caespitose-floccose, rarely extended in a cushion-like layer, 

 blue-green, becoming brownish with age; filaments 8-10 mic. in diameter, 

 2 cm. in height, repeatedly branched; false branches erect, spreading, flex- 

 uously curved; sheaths membranaceous, thin, usually inflated at the base 

 of the branches, colorless or yellowish; trichomes 6-8 mic. in diameter, 

 cylindrical; cells equal to or longer than the diameter; heterocysts one to 

 five, often colorless; cell contents blue-green. 



Alaska. Forming brownish or blue-green tufts, attached to rocks in 

 fresh water. Glacier Bay; Popof Islands. (Saunders). Massachusetts. On 

 mosses and various small plants. Spot Pond, Middlesex Fells. (Collins). 

 New Jersey. Often very abundant, in ponds. (Wolle). Plainfield. (Balen). 

 Maryland. On grasses in pools in abandoned brickyard. Baltimore. October 

 1896. (Humphrey). Michigan. Ann Arbor. (Reighard). Minnesota. In 

 tank. Botanical Department, University of Minnesota, Minneapolis. March 

 1909. (Tilden). South Dakota. Forming blue-green tufts or coatings on 

 reeds, finally becoming loosened and floating. Big Stone Lake. August 

 i8g8. (Saunders). Washington. Near Newhall, Orcas Island; Green 



Lake, Seattle. (Gardner). West Indies. On damp wall of dam. Sharp's 

 River, St. Vincent. May 1892. (Elliott). 



Forma bryophila Rabenhorst. Fl. Eur. Algar. 2: 273. 1865. De Toni. 

 1. c. 547- 



Wolle. Fresh-Water Algae U. S. 265. pi. 181. f. 5-7. 1887. 



Forming a widely extended, thin, papery layer; trichomes 2.5-3 mic. in 

 diameter. 



New Jersey. Often very abundant in ponds. (Wolle). Pennsylvania. 

 (Wolle). 



427. Tolypothrix lanata (Desvaux) Wartmann in Rabenhorst. Die Algen 

 Sachsens. no. 768. 1858. Bornet and Flahault. Revis. des Nostoc, 

 Ann. Sci. Nat. Bot. VII. 5: 120. 1887. De Toni. Syll. Algar. 5: 

 542. 1907. 



Wood. Contr. Hist. Fresh-Water Algae North America. 66. pi. 8. f. 

 I 1872. (T. d i s t o r t a var. Wood). Wolle. Fresh Water Algae. IV. Bull. 

 Torr. Bot Club. 7: 44. 1880. (T. aegagropila Kg.); Fresh-Water Algae 

 U. S. 263-265. pi. 180. f. 5-7, 14-16; pi. 181. f. 1-4. 1887. (T. m u s c i c o 1 a Kg., 



