Myxophyceae 173 



flats. Cedar Bayou, Harris County. (Ravenel). Indiana. Near Bloom- 

 ington. (Brown). Michigan. Grosse Isle, near mouth of Detroit River. 

 Summer of 1885. (Campbell). Minnesota. On damp ground on hillside. 

 Mendota. October 1901. (Hillesheim and Lilley). Iowa. A very common 

 alga in the damp margins of marshy places. Iowa City. 1880. (Hobby). 

 Ames. (Bessey, Buchanan). Grinnell. 1904. (Fink). Eagle Grove. 1904. (Bu- 

 chanan). Nebraska. On the ground and in shallow ponds in a pass 

 between two wet valleys. Cherry County. July 1892. (Smith and Pound). 

 Frequent on damp earth and in stagnant or running water. Often found 

 covering the ground for some distance in damp places. (Saunders). Kan- 

 sas. Attached to bare patches of soil. (Parry). Montana. "Common 

 throughout the state. On the high foot-hills (5,000-7,000 feet), on the 

 alkaline plains and in the valleys. In inundated places, where the water 

 is kept warm by the sun's rays, this Nostoc grows with marvelous rapidity, 

 and frequently attains a diameter of ten inches and a half in thickness." 

 (Anderson and Kelsey). Wyoming. Very plentiful in small pools on 

 ledges of rock. Telephone Canon, Albany County. April 1897. (Nelson). 

 New Mexico. Santa Fe. (Fendler). Washington. Whidbey Island. 

 (Gardner). Mexico. On damp soil in autumn; common after rain on 

 dry flats. Rio Bravo (Rio Grande). (Schott). Bermudas. On the ground. 

 Castle Point. February 1898. (Richards). West Indies. In crusts on 

 sandy soil. Constant Spring, Jamaica. April 1893. (Humphrey). Hawaii. 

 In dense forest. Near Halfway House, Kilauea, Hawaii. (Schauinsland). 

 Forming gelatinous, firm, flat wrinkled masses on boards of flume (not 

 covered by water), head of flume. (2,300 feet). Pacific Sugar Mill, Hama- 

 kua, Hawaii. July 1900. (Tilden). 



Var. flagelliforme (Berkeley and Curtis) Bornet and Flahault. 1. c. 

 206. Wright. Plantae Texanae. no. 3809. Harvey. 1. c. 115. Wood. 1. c. 

 226. De Toni. 1. c. 408. 



Farlow, Anderson and Eaton. Algae Am.-Bor. Exsicc. no. 100. 1878. 

 Anderson and Kelsey. Common and Conspicuous Algae of Montana. Bull. 

 Torr. Bot. Club. 18: 144. 1891. Collins, Holden and Setchell. Phyc. Bor.- 

 Am. Fasc. 31. no. 1505. 1908. 



Plant mass filiform, up to 3-4 mm. in width, firm; trichomes parallel. 



Texas. On naked aluminous soil. San Pedro. (Wright). Montana. 

 Very common on the alkali plains about Helena. It has the appearance 

 of "small weather-beaten, entangled tufts of black horsehair.'' (Anderson 

 and Kelsey). Mexico. On sandy soil. Mazapil, Zacatecas. (Lloyd). 



325. Nostoc sphaericum Vaucher. Histoire des Conferves d'eau douce. 223. 



pi. 16. f. 2. 1803. Bornet and Flahault. Revis. des Nostoc. Ann. 



Sci. Nat. Bot. VII. 7: 208. 1888. De Toni. Syll. Algar. 5: 409. 1907. 

 Wood. Contr. Hist. Fresh-Water Algae North America. 30. 1872. 

 Campbell. Plants of the Detroit River. Bull. Torr. Bot. Club. 13: 93. 1886. 

 Wolle. Fresh-Water Algae U. S. 283. pi. 197. f. 18-20. 1887. Collins. 



Algae of Middlesex County. 14. 1888. Bennett. Plants of Rhode Island. 

 114. 1888. Wolle and Martindale. Algae. Britton's Catalogue of Plants 

 found in New Jersey. Geol. Surv. N. J. 2: .606. 1889. Anderson and Kel- 

 sey. Common and Conspicuous Algae of Montana. Bull. Torr. Bot. Club. 



