Myxophyceae 223 



tuelle (1889). Bull. Soc. Bot. de France. 12. 1889. Bornet and Fla- 

 hault. Revis. des Nostoc. Ann. Sci. Nat. Bot. VII. 5 : loi. 1887. (S. 

 figuratum Ag.) De Toni. Syll. Algar. 5: 517. 1907. 

 Wood. Contr. Hist. Fresh-Water Algae North America. 60, 61. pi. 6. 

 1. I, 2. 1872. (S. therrnale Kg., S. calotrichoides Kg.). Nord- 

 stedt. Die Algis Aquae Dulcis et de Characeis ex Insulis Sandvicensibus a 

 Sv. Berggren 1875 reportatis. 6. 1878. Wolle. Fresh-Water Algae U. S. 

 351. pi. 183. f. 5-7. 1887; 259. 1887. Wolle and Martindale. Algae. Brit- 

 ton's Catalogue of Plants found in New Jersey. Geol. Surv. N. J. 2: 604. 

 1889. West and West. On some Fresh-water Algae from the West In- 

 dies. Journ. Linn. Soc. Bot. 30: 271. 1895. Setchell. Notes On Cyano- 

 phyceae. — I. Erythea. 4: 89. 1896; Notes on Cyanophyceae. — II. Erythea. 4: 

 193. 1896. Tilden. American Algae. Cent. III. no. 290. 1898. (S. m y o- 

 chrous (Dillw.) Ag.). West and West. A Further Contribution to 

 the Freshwater Algae of the West Indies. Journ. Linn. Soc. Bot. 34: 287. 

 1898-1900. Setchell. Notes on Cyanophyceae. — III. Erythea. 7: 48. 1899. 

 Tilden. American Algae. Cent. IV. no. 396. 1900. Collins, Holden and 

 Setchell. Phyc. Bor.-Am. Fasc. 18. no. 857. 1901. Saunders. The Algae. 

 Harriman Alaska Expedition. Proc. Wash. Acad. Sci. 3: 398. 1901. Til- 

 den. Algae Collecting in the Hawaiian Islands. Postelsia: The Year Book 

 of the Minnesota Seaside Station, i: 166. 1902. Setchell and Gardner. 

 Algae of Northwestern America. Univ. Calif. Pub. Bot. i: 195. 1903. Col- 

 lins. Phycological Notes of the late Isaac Holden. — II. Rhodora. 7: 237. 

 1905. Lemmermann. Algenfl. Sandwich.-Inseln. Bot. Jahrb. 34: 625. 1905. 

 Tilden. American Algae. Cent. VII. Fasc. i. no. 631. 1909. 



Plate XIII. fig. 2-s. 



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

 black or blackish green; filaments 15-21 mic. in diameter, tortuous, en- 

 tangled, 2-4 mm. or i cm. in thickness; sheaths lamellose, yellowish brown; 

 layers of the sheath scarcely diverging; trichomes 6-12 mic. in diameter; 

 basal cells long, cylindrical, the upper ones disc-shaped; heterocysts some- 

 what quadrate or longer than the diameter, brownish; cell contents yellow- 

 ish green. 



Alaska. On moist ground near Glacier Bay; in a freshwater stream 

 emptying into Glacier Bay; on the perpendicular surface of a rock moist- 

 ened by dripping water, Kukak Bay, July 1899. (Saunders). Connecticut. 

 Coating moist limestone rocks. On shore of Housatonic River, near Gay- 

 lordsville. June, October* 1901. (Holden). New York. Forming a dark brown 

 coating on wet rocks. Niagara. (Wolle). New Jersey. Frequent on sub- 

 merged sticks in ponds. (Wolle). South Carolina. Damp surface of 

 hard clay; in wet boggy places on rotten pine boards, September 1869. 

 (Ravenel). Sandy soil near Aiken. (Wolle). Minnesota. On sides of 

 rocks in stone quarry. Minneapolis. May 1899. (Crosby). Iowa. On 



cliffs. Fayette. 1897. (Fink). Colorado. In pannose layers upon the "Pil- 

 lars of Hercules," South Cheyenne Cafion, near Manitou. (Setchell). 

 Mexico. (Miiller). West Indies. On damp wall of dam. Sharp's River, 

 St. Vincent. May 1892; on trees, summit of Trois Pitons (4,500 feet), No- 

 vember and December 1892; on rocks, Hamstead Valley (850 feet), Do- 



