Myxophyceae 89 



United States. On damp earth. (Farlow). 



180. Spirulina caldaria Tilden. Observations on some West American 



Thermal Algae. Bot. Gaz. 25: 103. pi. 8. f. 20. 1908. De Toni. Syll. 

 Algar. 5: 2i6. 1907. 



Plate IV. fig. 48. 



Plant mass widely expanded, dark blue-green; trichomes .9 mic. in 

 diameter, short, somewhat straight and stiff, forming a very loose spiral 

 i.S mic. in diameter, the distance between the turns being 3.2 mic. 



Canada. Forming a thick richly colored stratum on the surface of hot 

 water very near the outlet of the springs. Natural Sulphur Springs. Banff. 

 August 1897. (Tilden). 



181. Spirulina versicolor Cohn in Rabenhorst. Fl. Eur. Algar. 2: 292. 1865. 



Gomont. Monogr. Oscill. 273. 1893. De Toni. Syll. Algar. 5: 213. 



1907. 

 Collins. Notes on New England Marine Algae. — VII. Bull. Torr. Bot. 

 Club. 23: 458. 1896; Preliminary Lists of New England Plants. — V. Marine 

 Algae. Rhodora. 2: 43. 1900. 



Plant mass delicate, mucous, dark purple; trichomes 1.2-1.8 mic. in 

 diameter, flexuous, twisted into a dense regular spiral 3-4.5 mic. in diameter, 

 the turns being close together; cell contents violet-purple. 



Maine. Among other algae on a mooring buoy that had been hauled up 

 on the beach. Cape Rosier. July 1896. (Collins). 



Lyngbya gracilis and Spirulina versicolor "are, as far 

 as I know, the only marine Nostochineaeofa red color found in Amer- 

 ica; and it is somewhat interesting that both should have been found at 

 the same time and place. The object on which they grew gives some- 

 what unusual conditions for the growth of algae; practically uniform depth 

 combined with considerable movement of the water. It would hardly be 

 safe to draw the conclusion that these conditions tended to produce tht 

 exceptional color, but it is of interest to note that the localities given by 

 Gomont for both species are in the Mediterranean, Adriatic and Baltic, in 

 all of which the tidal movement is quite small." — Collins. 



182. Spirulina subsalsa Oersted. Beretning om en Excursion til Trindelen, 

 alluvial Dannelse i Odensfjord. Nat. Tidskr. 17. pi. 7. f. 4. 1842. Go- 

 mont. Monogr. Oscill. 273. pi. 7. f. 32. 1893. De Toni. Syll. Algar. 

 S: 214. 1907. 

 Farlow, Anderson and Eaton. Algae Americae borealis exsiccatae. Fasc. 

 I-IV. no. 478. 1877. (S. tenuissima Kg.) Farlow. Marine Algae of 

 New England. 31. pi. 2. f. 4. 1881. Kjellman. The Algae of the Arctic Sea. 

 324. 1883. WoUe. Fresh-water Algae. U. S. 323. pi. 210. f. 3. 1887. Collins. 

 Algae of Middlesex County, Massachusetts. 15. 1888; Marine Algae of Nan- 

 tucket. 4. 1888. Martindale. Marine Algae of .the New Jersey coast and 

 adjacent waters of Staten Island. Mem. Torr. Bot. Club, i: 90. 1889. Wolle 

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

 Geol. Surv. N. J. 2: 610. 1889. Collins. Algae. Rand and Redfield's Flora 

 of Mount Desert Island, Maine. 248. 1894. Saunders. Protophyta-Phyco- 



