PRELIMINARY LIST OF THE ALGAE OF COLORADO III 



Micrasterias denticulata (Brebisson) Ralfs. [Wolle, Desmids of U.S., p. 109.] 



Bog Lake, June 10, 1908, Dodds (D218); Bog Lake, June 26, 1908, Dodds (D231); 

 Bog Lake, July 18, 1908, Dodds (D262). 

 M. rotate (Greville) Ralfs. [Wolle, Desmids of U.S., p. 109.] 



At head of Tank Creek, Southwestern Colorado, July, 1903, Tower; Black Lake, June 

 10, 1908, Dodds (D217). 

 Staurastrum arctison Ehrenberg. [Wolle, Desmids of U.S., p. 148.] 



East Lake, June 9, 1908, Dodds (D204); Lily Lake, August 19, 1908, Dodds (D321); 

 East Lake, August 31, 1908, Dodds (D371). 

 S. cuspidatum Brebisson. [Wolle, Desmids of U.S., p. 123.] 



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

 S. echinatum Brebisson. [Wolle, Desmids of U.S., p. 141.] 



At head of Tank Creek, Southwestern Colorado, July, 1903, Tower. 

 S. johnsoni coloradense Cushman. [Bull. Torr. Bot. Club, Vol. XXXI, pp. 161-164, 



1904.] 



At head of Tank Creek, Southwestern Colorado, July, 1903, Tower. 



Family ZYGNEMACEAE 



Zygnema pectinatum (Vaucher) Agardh. [Collins, Green Alg. of N.A., p. 103.] 



Creek below Long Lake, August 20, 1908, Ramaley (46). 

 Z. pectinatum var. anomalum (Ralfs) Kirchner. [Collins, Green Alg. of N.A., p. 103.] 



Wet Mountain Valley, 1889, Cockerell. 

 Z. pectinatum var. decussatum (Vaucher) Kirchner. [Collins, Green Alg. of N.A., p. 



103.] 



Redrock Lake, August 18, 1908, Ramaley (10). 

 Z. stellinum (Miiller) Agardh. [Collins, Green Alg. of N.A., p. 104.] 



Twin Lakes, August, 1903, Juday (44). 

 Spirogyra catenaeformis (Hassall) Kuetzing. [Collins, Green Alg. of N.A., p. 108.] 



Boulder Creek, near Boulder, in quiet water, March 3, 1910, Robbins (25). 

 S. communis (Hassall) Kuetzing. [Collins, Green Alg. of N.A., p. 109.] 



In ditch near Marshall, March 30, 1910, Robbins (26). 

 S. crassa Kuetzing. [Collins, Green Alg. of N.A., p. 112.] 



White Rocks, 5 miles east of Boulder, in spring at foot of sandstone cliff, November 

 30, 19 10, Robbins (52); same locality, January 22, 191 1, Robbins. 

 S. dubia Kuetzing. [Collins, Green Alg. of N.A., p. 115.] 



Manchester Lake, August 29, 1908, Ramaley (5); Tolland, June 6, 1909, Ramaley 

 (30), determined by Collins; Smartweed Lake, June 21, 1909, Ramaley (28); Boulder, 

 near Sanitarium, March 10, 1910, Robbins (29). 

 S. gracilis (Hassall) Kuetzing. [Collins, Green Alg. of N.A., p. 114.] 



Boulder, May 7, 1905, Ramaley (31). 

 S. grevilleana (Hassall) Kuetzing. [Collins, Green Alg. of N.A., p. 117.] 



Boulder Creek, near Boulder, quiet water, March 3, 1910, Robbins (25). 



