Myxophyceae 247 



Algae North America. 69, 71. pi. 8. f. 2, 3. 1872. (Sirosiphon pellu- 

 cidulus Wood, S. neglectus Wood). Wolle. Fresh Water Algae. 

 III. Bull. Torr. Bot. Club. 6: 185. 1877. (Sirosiphon crameri Brtigg). 

 Nordstedt. De Algis Aquae Dulcis et de Characeis ex Insulis Sandvicensi- 

 bus a Sv. Berggren 1875 reportatis. 7. 1878. Wolle. Fresh Water Algae. 

 Bull. Torr. Bot. Club. 6: 285. 1879. (Sirosiphon ocellatus Kg.) 

 Farlow. Notes on the Cryptogamic Flora of the White Mountains. Ap- 

 palachfa. 3: 236. 1883. Wittrock and Nordstedt. Algae Aq. Dulc. Exsicc. 

 no. 668. 1883. Wolle. Fresh-Water Algae U. S. 272. pi. 194. f. i-3. 11-16. 

 1887. Bennett. Plants of Rhode Island. 114. 1888. Wolle and Martin- 

 dale. Algae. Britton's Catalogue of Plants found in New Jersey. Geol. Surv. 

 N. J. 2: 60s. 1889. Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 

 10. no. 455. 1898. Setchell. Notes on Cyanophyceae. — III. Erythea. 7: 

 48. 1899. Saunders. The Algae. Harriman Alaska Expedition. Proc. 



Wash. Acad. Sci. 3: 399. 1901. Setchell and Gardner. Algae of North- 

 western America. Univ. Calif. Pub. Bot. i: 196. 1903. Collins. Algae of 

 the Flume. Rhodora. 6: 230. 1904. Lemmermann. Algenfl. Sandwich.-In- 

 seln. Bot. Jahrb. 34: 625. 1905. Collins, Holden and Setchell. Phyc. 



Bor.-Am. Fasc. 27. no. 1309. igo6. Tilden. Notes on a collection of Algae 

 from Guatemala. Proc. Biol. Soc. Wash. 21: 155. 1908; American Algae. 

 Cent. VII. Fasc. i. no. 626. 1909. 



Plate XV. fig. 15-17. 



Plant mass caespitose or cushion-like, woolly, brownish; filaments 3-8 

 mm. long, erect, decumbent at the base, irregularly branched; branches 

 scarcely more slender than the primary filaments, 35-45 mic. in diameter, 

 elongate, straight, spreading, all bearing hormogones; sheaths thick, lamel- 

 lose, colorless or yellowish brown; trichomes consisting of one, rarely 

 two rows of cells; cells 20-30 mic. in diameter, of various sizes, often 

 wider than long, each surrounded by a special, darker colored envelope; 

 heterocysts rare, lateral; hormogones 15 mic. in diameter, 50-65 mic. in 

 length. 



Alaska. On rocks in a rapid stream emptying into Glacier Bay; floating 

 in a quiet freshwater pool. Prince William Sound, June 1899. (Saunders). 

 New Hampshire. Common on the wet rocks of the Flume and Berlin Falls. 

 (Farlow). One of the species composing the brown coating on wall of 

 Flume. September 1904; among decaying vegetation on bottom of lake. 

 Lake Chocorua. September 1906. (Collins). Massachusetts. Attached to 

 Sedges in freshwater swamp. Falmouth. August 1897. (Moore). Rhode 

 Island. Quidnessett. (Bennett). New York. Forming, with minute 



mosses, a blackish, turfy coating to a steep slope of bare rock (s,ooo feet), 

 over portions of which water is continually dripping. Near top of Mount 

 Tahawus, Adirondack Mountains. (Wood). New Jersey. Forming, with 

 various other species of algae, a gelatinous blue-green or brown stratum; in 

 a very stagnant pool; on submerged sticks in swampy places, "in dark 

 brown waving tufts, about one-half inch in length"; Bamber Lake, 1883. 

 (Wolle). Florida. In a marsh pool. Near Hibernia. (Canby). Central 

 America. Growing on edges of steam-holes on side of Volcano Santa 

 Maria, near Lake Atitlan. February 1906. (Kellerman). West Indies. On 



