Myxophyceae 127 



transverse walls sometimes marked by fine granules; cell contents some- 

 what homogeneous or finely granular, pale blue-green. 



Nebraska. On moist earth. Lincoln. (Bessey, Pound and Clements). 

 Washington. Floating among various filamentous algae. Lake Washington, 

 Seattle. (Gardner). 



240. Lyngbya arachnoidea Kuetz. Sp. Algar. 282. 1849. De Toni. Syll. 

 Algar. s: 266. 1907. 



Schramm and Maze. Essai Class. Algues Guadeloupe. 31. 1865. Maze 

 and Schramm. Essai Class. Algues Guadeloupe. 28. 1870-1877. 



Plant mass dark green, becoming brownish or sometimes reddish; 

 filaments 15-19 mic. in diameter, flexible, loosely entangled; sheaths color- 

 less, transparent; trichomes 12.5 mic. in diameter, interrupted in lower por- 

 tions; cells very short; cell contents granular, olive or blue-green. 



West Indies. In stagnant water. (Schomburgk). 



Species not well understood. 



241. Lyngbya bicolor Wood. Prodromus of a study of the fresh-water 



Algae of eastern North America. Proc. Am. Phil. Soc. 11: 124. 1869; 

 Cont. Hist. Fresh-Water Algae North America. 22. pi. i. f. 7. 1872. 

 De Toni. Syll. Algar. 5: 290. 1907. 

 Plant mass a blackish or bluish-green mat; filaments variously curved, 

 closely interwoven, simple; sheaths firm, transparent, in old filaments mod- 

 erately thick; trichomes sometimes constricted at joints, often interrupted; 

 cells short; transverse walls usually not visible; cell contents mostly very 

 granular, light blue-green. 



Pennsylvania. Forming dark waving tufts, a half-inch or more in height, 

 adherent to bottom of stream, or to plants, sticks, etc. In shallow water 

 of the Schuylkill River, near Spring Mills, Philadelphia. (Wood). 



242. Lyngbya caeruleo-violacea Crouan in Schramm and Maze. Essai Class. 



Algues Guadeloupe. 38. 1865. Maze and Schramm. Essai Class. Al- 

 gues Guadeloupe. 21. 1870-1877. De Toni. Syll. Algar. S: 292. 1907. 

 Murray. Catalogue of the Marine Algae of the West Indian Region. 

 Journ. of Bot. 27: 261. 1889. 



"Filamentis 1/2-1 cm. longis, in flocculos basim ad chordae ad instar 

 convolutis, apice liberis, articulis subtiliter granulatis, diam. s-plo brevior- 

 ibus; strato siccitate violaceo-albido." 

 West Indies. Guadeloupe. (Maze). 



243. Lyngbya fluitans Hering in Krauss. Pflanzen des Cap- und Natal- 



Landes, gesammelt und zusammengestellt. Flora. 215. 1846. De 

 Toni. Syll. Algar. 5: 290. 1907. 

 Murray. Catalogue of the Marine Algae of the West Indian Region. 

 Journ. of Bot. 27: 261. 1889. 



"Fills aeruginosis, tenuissimis, flaccidis, in caespitem tripollicarem laxe 

 implicatis." 



West Indies. Guadeloupe. (Maze). 



