Myxophyceae 219 



1819. Bornet and Flahault. Revis. des Nostoc. Ann. Sci. Nat. Bot. 

 VII. 5: 95. 1887. De Toni. Syll. Algar. 5: 509. 1907. 

 Maze and Schramm. Essai Class. Algues Guadeloupe. 33. 1870-1877. 

 (S. torridum Agardh, S. parietinum Crouan). WoUe. Fresh- 



Water Algae U. S. 258. pi. 188. f. 1-4, 10-14. 1887. (S. c i n e r e u m Men- 

 egh.). Wolle and Martindale. Algae. Britton's Catalogue of Plants found 

 in New Jersey. Geol. Surv. N. J. 2: 605. 1889. Saunders. Protophyta- 

 Phycophyta. Flora of Nebraska. 24. pi. 2. f. 24. 1894. Bessey. Additions 

 to the Reported Flora of Nebraska made during 1893. Bot. Surv. Ne- 

 braska. '3: 5. 1894. Setchell. Notes on Cyanophyceae. — I. Erythea. 4: 88. 

 1896. Wittrock, Nordstedt, and Lagerheim. Algae Aq. Dulc. Exsicc. no. 

 1322. 1896. Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 5. no. 

 210. 1896; Fasc. 15. no. 711. 1900. Bessey, Pound and Clements. Additions 

 to the Reported Flora of the State. Bot. Surv. Nebraska. 5: I4- ipoi- Col- 

 lins. The Algae of Jamaica. Proc. Am. Acad. Arts Sci. 37: 241. 1901; Algae 

 of the Flume. Rhodora. 6: 230. 1904; Phycological Notes on the late Isaac 

 Holden. — II. Rhodora. 7. 237. 1905. Lemmermann. Algenfl. Sandwich.- 

 Inseln. Bot. Jahrb. 34: 625. 1905. 



Plate XII. fig. 8. 



Plant mass cushion-shaped, black or gray becoming bluish; filaments 

 10-18 mic. in diameter, up to 3 mm. in length, entangled, branched; false 

 branches short; sheaths firm, becoming brownish; trichomes 6-14 mic. in 

 diameter, cells shorter than the diameter or quadrate, heterocysts some- 

 what quadrate, yellowish; cell contents olive green. 



New Hampshire. One of the three species composing the brown coating 

 on the wall of the "Flume." September 1904. (Collins). Massachusetts, 

 Forming a dark brown felt upon rocks just above the surface of the water. 

 Massapoag Brook, at Sharon. April 1891. (Setchell). Connecticut. On 

 dripping rocks. Sage's Ravine, Salisbury. August. (Holden). New York. 

 (Wolle). New Jersey. On moist rocks. Bergen, Godwinville. (Austin). 

 Pennsylvania. On moist rocks and shaded walls. (Wolle). Florida. 



(^Wolle). Nebraska. On flower pots in greenhouse. University, Lincoln. 

 (Bessey, Saunders). Bermudas. On sand dunes. Paget. January 1900. 

 CFarlow). West Indies. On bark of trees. Near Constant Spring, Kings- 

 ton, Jamaica. December 1892. (Lagerheim). On old palm stems. Castleton, 

 Jamaica. April 1893. (Humphrey). Hawaii. (Berggren, Schauinsland). 



402. Scytonema intertextum (Kuetzing) Rabenhorst. Fl. Eur. Algar. 2: 

 263. 1865. De Toni. Syll. Algar. 5: 511. 1907. 

 Wolle. Fresh Water Algae. Bull. Torr. Bot. Club. 6: 284. 1879;. Fresh- 

 Water Algae U. S. 258. pi. 186. f. 10-17. 1887. 



Plate XII. fig. 9. 



Plant mass more or less thick, cushion-shaped, compact, dark brown 

 or olive; filaments up to 20 mic. in diameter, ascending; false branches 

 fasciculate, flexuously curved, densely entangled; sheaths somewhat thick, 

 sometimes a little swollen, distinctly lamellose, yellowish or flesh-colored. 



