Myxophyceae 183 



des Nostoc. Ann. Sci. Nat. Bot. VII. 7: 243. 1888. De Toni. Syll. 



Algar. 5: 432. 1907. 

 Farlow. Marine Algae New England. 31. 1881. Collins. Algae of 

 Middlesex County. 14. 1888. Martindale. Marine Algae of the New Jer- 

 sey Coast and Adjacent Waters of Staten Island. Mem. Torr. Bot. Club, i; 

 92. 1889. Collins. Preliminary Lists of New England Plants. V. Marine 

 Algae. Rhodora. 2: 42. 1900. Bessey, Pound and Clements. Additions 

 to the Reported Flora of the State. Bot. Surv. Nebraska. 5: 12. 1901. 

 Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 21. no. 1013. 1903; 

 Ease. 22. no. 1062. 1903. Setchell and Gardner. Algae of Northwestern 

 America. Univ. Calif. Pub. Bot. i: 192. 1903. West. West Indian Fresh- 

 water Algae. Journ. of Bot. 42: 291. 1904. Tilden. Notes on a Collection 

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



Plate IX. fig. I, 2. 



Filaments 4-6 mic. in diameter, tapering at the ends, terminated by 

 an obtuse conical cell; sheaths thin, colorless, distinct; cells before division 

 about as long as broad or a little longer; gonidia 8 mic. in diameter, some- 

 what spherical, yellowish brown. 



Maine. In a high pool, exposed to spray only. Ragged Island, Casco 

 Bay. July 1903. (Collins). New Hampshire. (Collins). Massachusetts. 

 Found in small quantities, mixed with Sphaerozyga, in company 

 with Rhizoclonium. Charles River, Cambridge; also in salt marshes. 

 (Farlow). Connecticut. (Collins). New York. Mariners' Harbor. 



Staten Island. (Pike). Nebraska. In ponds and running water. South 

 Bend. (Bessey). Washingfton. On mud by the roadside. Near La Con- 

 ner, Skagit County. May 1901. (Gardner). Central America. Associated 

 with Phormidium valderianum. Laguna Lake, Amatitlan (3,950 

 feet). February 1905. (Kellerman). 



341. Nodularia sphaerocarpa Bornet and Flahault. Revis. des Nostoc. Ann. 



Sci. Nat. Bot. VII. 7: 245. 1888. De Toni. Syll. Algar. 5: 433. 1907. 

 Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 22. no. 1063. 1903. 

 Plate IX. fig. 3. 



Filaments 6-j mic. in diameter, entangled; sheaths thin, colorless, finally 

 diffluent; cells 6 mic. in diameter, 4 mic. in length; heterocysts about as 

 large as the cells; gonidia 7-10 mic. in diameter, depressed spherical, brown- 

 ish, two to twelve in series. 



California. Forming a thin layer on the moist shady side of a sandy 

 clifif. Bolinas, Marin County. May 1903. (Gardner). 



342. Nodularia paludosa Wolle. Fresh-Water Algae U. S. 291. pi. 198. f. 



3, 4. 1887. De Toni. Syll. Algar. 5: 435. 1907. 

 Bessey, Pound and Clements. Additions to the Reported Flora of the 

 State. Bot. Surv. Nebraska. 4: 24. 1896. 



Plate IX. fig. 4. 



Filaments single or in small clusters;, sheaths rarely present, soon 

 diffluent; trichomes 6-8 mic. in diameter, nearly straight; cells short, about 



