Myxophyceae i8i 



338. Nostoc parmelioides Kuetzing. Phyc. Gen. 206. 1843. Bornet and 

 Flahault. Revis. des Nostoc. Ann. Sci. Nat. Bot. VII. 7: 219. 1888. 

 De Toni. Syll. Algar. 5: 422. 1907. 

 Harvey. Nereis Boreali-Americana. Part III. 114, 134. 1858. (N. c r i s- 

 t a t u m Bailey, N. Sutherland! Dickie). Schramm and Maze. Essai 

 Class. Algues Guadeloupe. 29. 1865. (Hydrococcus guadelupensis 

 Crouan). Maze and Schramm. Essai Class. Algues Guadeloupe. 13. 1870- 

 1877. (Oncobyrsa guadelupensis Crouan). Wood. Contr. 



Hist. Fresh-Water Algae North America. 29. 1872. N. alpinum Wood). 

 WoUe. Fresh Water Algae. III. Bull. Torr. Bot. Club. 6: 183. 1877; Fresh- 

 Water Algae U. S. 285. pi. 197. f. 33, 34. 1887. Setchell. Notes on some- 

 Cyanophyceae of New England. Bull. Torr. Bot. Club. 22: 428. 1895. Col- 

 lins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 2. no. 57. 1895. Tilden 

 American Algae. Cent. II. no. 168. 1896. Collins, Holden and Setchell. 

 Phyc. Bor.-Am. Fasc. 5. no. 236. 1896. Tilden. American Algae. Cent. 

 VI. no. 584. 1902. 



Plate VIII. fig. 20. 



Colonies attached, disc-shaped or tongue-shaped, hard, sometimes, 

 somewhat spherical, of various sizes, up to 2 cm. in diameter; filaments 

 •radiating from the center, somewhat straight at the center, parallel, en- 

 tangled, those near the surface densely twisted and entangled; "sheaths of 

 cuter filaments yellowish, distinct, those of the inner, colorless, often con- 

 fluent; trichomes 4-4.5 mic. in diameter; cells spherical or spherical de- 

 pressed, closely connected; heterocysts 6 mic. in diameter, somewhat 

 spherical; gonidia 4-5 mic. in diameter, 7-8 mic. in length, oval; wall of 

 gonidium smooth, yellowish. 



Canada. South side of harbor in winter quarters. Baffin's Bay. July 

 1851. (Sutherland). Connecticut. Attached at one point to smooth sand- 

 stone bed of a mountain rivulet. Mt. Carmel. September 1893. (Setchell).. 

 Goshen. August 1895. (Green). New York. In mountain rivulets, at- 

 tached to stones under water. Near West Point. (Bailey). Crumelbow 

 Creek, Hyde Park, New York City. (Harvey). Palisades. (Wolle). Penn- 

 sylvania. Abundant on stones on rocky bottom of river. Susquehanna River,, 

 at Harrisburgh. (Wolle). Near Harrisburgh. (Kelley). Wyoming. At- 

 tached to granitic rocks in creek about four miles from the melting snovv^ 

 which feeds the creek. (9,000 feet). North Fork, Clear Creek, Big Horn 

 Mountains. August 1898. (Williams and Griffiths). Nevada. In cold 

 streams. Clover Mountains. (11,000 feet). (Watson). 



Genus WOLLEA Bornet and Flahault. Revis. des Nostoc. 223. 1888. 



Plant mass or colony tubular, cylindrical, somewhat membranaceous^ 

 soft; filaments somewhat straight, parallel or slightly curved, agglutinated; 

 sheaths confluent; heterocysts intercalary; gonidia catenate, contiguous to- 

 the heterocysts or remote from them. 



339. WoUea saccata (Wolle) Bornet and Flahault. Revis. des Nostoc. Ann. 

 Sci. Nat. Bot. VII. 7: 223. 1888. Wolle. Fresh Water Algae. IV. 



