Myxophyceae 107 



Mill River, June, July, September. (Holden). Minnesota. On rocks under 

 water fall. Bridal Veil Falls, Minneapolis. October 1901. (Hillesheim). 

 South Dakota. In tank of artesian waters. Aberdeen. June 1896. (Griffiths). 

 Nebraska. In aquaria. Lincoln. (Bessey, Pound and Clements). Wash- 

 ington. La Conner, Skagit County; Seattle. (Gardner). Central Amer- 

 ica. On rocks at edge of lake. Lake Amatitlan, Guatemala. January 1906. 

 (Kellerman). 



211. Phormidium autumnale (Agardh) Gomont. Monogr. Oscill. 207. pi. 5. 

 f. 23, 24. 1893. De Toni. Syll. Algar. 5: 252. 1907. 



WoUe. Fresh Water Algae. II. Bull. Torr. Bot. Club. 6: 183. 1877. 

 fPh. vulgare Kg.); Fresh Water Algae. III. Bull. Torr. Bot. Club. 6: 

 183. 1877. (Ph. vulgare publicum. Kg.); Fresh Water Algae. U. S. 

 310. pi. 206. f. 8. 1887. (O. antliaria Juerg.). Farlow. Notes on the 

 Cryptogamic Flora of the White Mountains.' Appalachia. 3: 236. 1883. (L. 

 vulgaris Kirchn.). Bennett. Plants of Rhode Island. 114. 1888. 



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

 Jersey. Geol. Surv. N. J. 2: 608. 1889. Mackenzie. A Preliminary List of 

 Algae collected in the Neighborhood of Toronto. Proc. Can. Inst. III. 7: 

 270. 1890. Saunders. Protophyta-Phycophyta. Flora of Nebraska. 22. pi. 

 I. f. IS. pi. 2. f. 22. 1894. Tilden. List of Fresh-Water Algae collected in 

 Minnesota during 1893. Minn. Bot. Studies, i : 31. 1894. Collins, Holden 

 and Setchell. Phyc. Bor.-Am. Fasc. 9. no. 401. 1898. Setchell. Notes on 

 Cyanophyceae. III. Erythea. 7: 53. 1899. Collins. Preliminary Lists of 

 New England Plants. — V. Marine Algae. Rhodora. 2: 42. 1900. Saunders. 

 The Algae. Harriman Alaska Expedition. Proc. Wash. Acad. Sci. 3: 398. 

 1901. Tilden. American Algae. Cent. VI. no. 591. 1902. Collins, 



Holden and Setchell. Phyc. Bor.-Am. Fasc. 23. no. 1104. 1903. Setchell 

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

 186. 1903. Borgesen and Jonsson. The Distribution of the Marine Algae 

 of the Arctic Sea and of the Northernmost Part of the Atlantic. Botany of 

 the Faeroes. Appendix. XXV. 1905. Buchanan. Notes on the Algae of 

 Iowa. Proc. Iowa Acad. Sci. 14: 13. 1908. 



Plate V. fig. 18, 19. 



Plant mass expanded, fragile, glistening, dark blue-green, sometimes 

 yellowish or dark-colored; filaments straight, rarely flexuous, entangled; 

 sheaths narrow, fragile, mucous, distinct or diffluent into an amorphous 

 mucus and agglutinated; trichomes 4-7 mic. in diameter, not constricted at 

 joints; apex of trichome briefly tapering, straight or scarcely curved, espe- 

 cially capitate; apical cell showing a rotund calyptra; cells 2-5 mic. in 

 length; transverse walls frequently granulated; cell contents blue-green. 



Alaska. Forming a thin dark blue coating on small rocks in a rapid 

 stream emptying into bay. Kukak Bay. (Saunders). Iliuliuk, Unalaska; Sitka. 

 (Setchell and Lawson). Canada. Humber River. Toronto. (Mackenzie). 

 New Hampshire. On mosses. Berlin Falls. (Farlow). Massachusetts. On 

 stone drinking fountain. Revere. October 1897. (Collins). Rhode Island. 

 Very common. (Bennett). Growing in a freshwater stream, on the surface 

 of a rock frequently washed by salt water, and in a storm practically sub- 



