126 Minnesota Algae 



Crouan, L. fontana crassior Crouan). Collins. The Algae of 



Jamaica. Proc. Am. Acad. Arts Sci. 37: 240. 1901. 



Plate V. fig. 4S. 



Plant mass up to I dm. in length, caespitose, widely expanded, elongate, 

 penicillate, sometimes becoming dark violet or black; filaments very long, 

 more or less flexuous and entangled at the base, above straight, parallel, 

 rigid; sheaths colorless, thin, papery; trichomes 7.5-13 mic. in diameter, 

 especially constricted at joints; apex of trichome not tapering; apical cell 

 rotund; calyptra none; cells 3-10 mic. in length; transverse walls some- 

 times granulated; cell contents granular, blue or blue-green. 



West Indies. (Maze and Schramm). Morant Bay, Jamaica. July 1900. 

 (Pease and Butler). 



238. Lyngbya major Meneghini. Conspectus Algologiae euganeae. 12. 1837. 



Gomont. Monogr. Oscill. 164. pi. 3. f. 15. 1893. De Toni. SylK 

 Algar. 5: 279. 1907. 



WoUe. Fresh Water Algae. Bull. Torr. Bot. Club. 6: 283. 1879. Mur- 

 ray. Catalogue of the Marine Algae of the West Indian Region. Journ. of 

 Bot. 27: 261. 1889. Bessey, Pound and Clements. Additions to the Re- 

 ported Flora of the State. Bot. Surv. Nebraska. 5: 12. 1901. West. West 

 Indian Freshwater Algae. Journ. of Bot. 42: 291. 1904. 



Plate V. fig. 46. 



Filaments caespitose, elongate, straight, rigid, dark green; sheaths color- 

 less, thick, lamellose, roughened; trichomes 11-16 mic. in diameter, not 

 constricted at joints; apex of trichome slightly tapering, somewhat capi- 

 tate; apical cell showing a slightly thickened outer membrane; cells 2-3.4 

 mic. in length; transverse walls granulated; cell contents dark blue-green. 



Florida. St. Lucia River. (Smith). Nebraska. In aquaria. Lincoln. 

 (Bessey, Pound and Clements). West Indies. Guadeloupe. (Maze). 



Morant Bay, Jamaica. July 1900. (Pease and Butler). Bay Estate, Barbados. 

 (Howard). 



239. Lyngbya spirulinoides Gomont. Essai Class. Nostocacees homocystees. 



Morot. Journ. de Bot. 4: 355. 1890; Monogr. Oscill. 166. pi. 3. f. 



18, 19. 1893. De Toni. Syll. Algar. 5: 287. 1907. 

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

 State. Bot. Surv. Nebraska. 5: 13. 1901. Setchell and Gardner. Algae of 

 Northwestern America. Univ. Calif. Pub. Bot. i: 187. 1903. 



Plate V. fig. 47. 



Plant mass floating, olive green; filaments entangled, fragile, forming a 

 regular loose spiral throughout the whole or a portion of their length, or 

 sometimes straight throughout; distance between turns of spiral 73-108 

 mic; sheaths colorless, thin, somewhat mucous, not lamellose; trichomes 

 14-16 mic. in diameter, not constricted at joints; apex of trichome not 

 tapering; apical cell rotund; calyptra none; cells 3.4-6.8 mic. in length; 



