224 Minnesota Algae 



minica, January and February 1896. (Elliott). Hawaii. In stagnant 

 water. Mauna Kea, Hawaii. (Berggren, Schauinsland). 



Var. leprieurii (Montagne) Bornet and Flahault. 1. c. 103. De Toni. 

 1. c. 520. 



Schramm and Maze. Essai Class. Algues Guadeloupe. 32. 1865. Maze 

 and Schramm. Essai Class. Algues Guadeloupe. 34. 1870-1877. Collins, 

 Holden and Setchell. Phyc. Bor.-Am. Fasc. 21. no. 1014. 1903. 



Outer layers of sheath gelatinous, colorless. 



Canada. Warm sulphur springs, Banff, Alberta. June 1901. (Butler and 

 Policy). West Indies. (Maze and Schramm). 



412. Scytonema myochrous (Dillwyn) Agardh. Dispositio Algar. sueciae. 

 38. 1812. Bornet and Flahault. Revis. des Nostoc. Ann. Sci. Nat. 

 Bot. VII. 5: 104. 1887. De Toni. Syll. Algar. 5: 521. 1907. 



Dickie. In Hooker. An Account of the Plants collected by Dr. Walker 

 in Greenland and Arctic America during the Expedition of Sir Francis 

 M'Clintock, R. N., in the Yacht "Fox." Journ. Linn. Soc. Bot. 5: 86. 1861; 

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

 James Taylor, and Remarks on Arctic Species in General. 1. c. 9: 242. 1867. 

 Wood. Prodromus of a Study of the Fresh- Water Algae of Eastern North 

 America. Proc. Am. Phil. Soc. 11: 129. 1869. (S. cataractae Wood); 

 Contr. Fresh-Water Algae North America. 62. pi. 7. f. i. 1872. Raben- 

 horst. Die Algen Europas. no. 2492. 1877. Wolle. Fresh-Water Algae. 

 6: 184. 1877. (S. brandegei Wolle); Fresh-Water Algae U. S. 252, 253. 

 pi. 182. f. 1-3; pi. 183. f. 1-4; pi. 185. f. 1-7. 1887. (S. gracile Kg., S. t u r- 

 fosumKg.). Bennett. Plants of Rhode Island. 114. 1888. Wolle and 

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

 Geol. Surv. N. J. 2: 605. 1889. Collins, Holden and Setchell. Phyc. Bor.- 

 Am. Fasc. 3. no. 109. 1895. Setchell. Notes on Cyanophyceae. — II. Ery- 

 thea. 4: 192, 193. 1896. Collins. Some Perforating and other Algae on 

 Fresh- Water Shells. Erythea. 5: 96. 1897. Saunders. Algae. Harriman 

 Alaska Expedition. Proc. Wash. Acad. Sci. 3: 398. 1901. Setchell and 

 Gardner. Algae of Northwestern America. Univ. Calif. Pub. Bot. i: 195. 

 1903. Collins. Phycological Notes of the late Isaac Holden. — II. Rho- 

 dora. 7: 237. 1905. Buchanan. Notes on the Algae of Iowa. Proc. Iowa 

 A-cad. Sci. 14: 10. 1908. 



Plate XIII. fig. 6. 



Plant mass woolly, widely expanded, spongy-tomentose, brownish black 

 or blackish green; filaments 18-36 mic. in diameter, 2-15 mm. long, tor- 

 tuous, entangled; sheaths lamellose, yellowish brown; layers of the sheath 

 diverging; trichomes 6-12 mic. in diameter; basal cells long, cylindrical, the 

 upper ones disc-shaped; heterocysts somewhat quadrate or longer than 

 their diameter, brown; gonidia spherical, yellowish brown; cell contents 

 yellowish green. 



Alaska. Forming small tufts on rocks in a brook emptying into Glacier 

 Bay. (Saunders). Greenland. (Borgesen). Canada. Fresh water. Port 

 Kennedy. (Walker). Cumberland Sound. (Taylor). Forming broad turf- 



