106 UNIVERSITY OF COLORADO STUDIES 



have been omitted and a great deal of material remains to be examined 

 for the first time. The writer is at present engaged in a study of the 

 algae in Colorado soils. Studies now in progress will afford a good 

 number of additions to the list. 



It is too early to discuss the distribution of Colorado algae; how- 

 ever, enough is known to indicate that certain species have a charac- 

 teristic altitudinal distribution and rather marked ecological relations. 



Mr. Frank S. Collins, of Maiden, Mass., has kindly determined 

 several species as hereinafter indicated. The number of the vial con- 

 taining the species is placed in parenthesis, except in a very few cases 

 in which the material was determined fresh and no specimen kept. 

 The vial numbers preceded by "D" refer to the Entomostracan 

 collection of Dr. Dodds. All other vial numbers refer to the 

 general collection of algae at the University of Colorado. 



Class CYANOPHYCEAE 



Order COCCOGONALES 



Family CHROOCOCCACEAE 



Synechococcus racemosus Wolle. [Tilden, Minn. Alg., p. nj 



Boulder, attached to sides of flowerpot, biological laboratory, University of Colorado, 

 January 29, 1910, Robbins. 

 Chrootheca monococca var. mellea (Kuetzing) Hansgirg. [Tilden, Minn. Alg., p. 13.] 



" Colorado, Wolle." Tilden. 

 Gloeocapsa conglomerata Kuetzing. [Tilden, Minn. Alg., p. 18.] 



"Colorado, on Cladophora (Porter, Wolle)." Tilden. 

 G. mellea Kuetzing. [Tilden, Minn. Alg., p. 18.] 



"Colorado, on walls and bare earth, often mixed with other algae (Wolle)." Tilden. 

 Microcystis marginata (Meneghini) Kuetzing. [Tilden, Minn. Alg., p. 34.] 



Gregory Canyon, near Boulder, floating on stagnant water along creek, October 15, 

 1910, Robbins. 

 Coelosphaerium kuetzingianum Naegeli. [Tilden, Minn. Alg., p. 40.] 



Eagle Lake, surface tow, August 19, 1910, Juday (48). 

 Merisraopedium glaucum (Ehrenberg) Naegeli. [Tilden, Minn. Alg., p. 43.] 



Redrock Lake, August 18, 1908, Ramaley (1). 

 M. tenuissimum Lemmermann. [Tilden, Minn. Alg., p. 45.] 



Reservoir No. 1, near La Junta, July 28, 1908, Dodds (D277). 

 Eucapsis alpina Clements & Shantz. [Tilden, Minn. Alg., p. 45.] 



"Colorado, Alpine pond on Bald Mountain (12,100 feet), September, 1904 (Shantz)." 

 Tilden. 



