IIO UNIVERSITY OF COLORADO STUDIES 



Cosmarium balteum coloradense Cushman. [Bull. Torr. Bot. Club, Vol. XXXI, pp. 



161-164, 1904.] 



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

 C. botrytis Meneghini. [Wolle, Desmids of U.S., p. 74.] 



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

 C. brebissonii Meneghini. [Wolle, Desmids of U.S., p. 75.] 



South Boulder Creek, 2 miles above Tolland, June 15, 1910, Robbins (58). 

 C. margaritiferam Meneghini. [Wolle, Desmids of U.S., p. 74.] 



At the head of Tank Creek, Southwestern Colorado, July, 1903, Tower; Teller Lake, 

 June 23, 1909, Robbins (8). 

 C. meneghini braunii (Reinsch) Hansgirg. 



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

 C. nitidulum DeNot. [Wolle, Desmids of U.S., p. 62.] 



Wet Mountain Valley, 1889, Cockerell; Black Lake, June 10, 1908, Dodds (D217). 

 C. phaseolus Brebisson. [Wolle, Desmids of U.S., p. 81.] 



Redrock Lake, August 18, 1908; Ramaley (1); Eldora Lake, July 14, 191 1, Bruderlin. 

 C. sexangulare Lund. [Wolle, Desmids of U.S., p. 63.] 



South Boulder Creek, 2 miles above Tolland, June 15, 1909, Robbins (9). 

 C. tetraophthalmum (Kuetzing) Brebisson. [Wolle, Desmids of U.S., p. 75.] 



East Lake, June 9, 1908, Dodds (D204); Eldora Lake, July 14, 1910, Goldsworthy. 

 C. undulatum var. crenulatum Wolle. [Wolle, Desmids of U.S., p. 67.] 



Semper Pond, July n, 1908, Dodds (D256); South Boulder Creek, 2 miles above 

 Tolland, June 15, 1909, Robbins (9); Teller Lake, June 23, 1909, Robbins (8). 

 Xanthidium antelopaeum var. polymazum Nord. [Wolle, Desmids of U.S., p. 94.] 



Bog Lake, June 10, 1908, Dodds (D218); Baby Lake, August 19, 1908, Dodds (D323). 

 X. cristatum (Brebisson) Ralfs. [Wolle, Desmids of U.S., p. 93.] 



Black Lake, June 10, 1908, Dodds (D217); Eldora Lake, July 14, 1910, Bruderlin. 

 X. hastifenim johnsoni forma longispinum Cushman. [Bull. Torr. Bot. Club, Vol. 



XXXI, pp. 161-164, 1904.] 



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

 X. hastiferum toweri Cushman. [Bull. Torr. Bot. Club, Vol. XXXI, pp. 161-164, 



1904.] 



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

 Euastrum ansatum (Ehrenberg) Ralfs. [Wolle, Desmids of U.S., p. 99.] 



Wet Mountain Valley, 1889, Cockerell. 

 E. compactum Wolle. [Wolle, Desmids of U.S., p. 107.] 



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

 E. didelta (Turp.) Ralfs. [Wolle, Desmids of U.S., p. 99.] 



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

 E. verrucosum (Ehrenberg) Ralfs. [Wolle, Desmids of U.S., p. 100.] 



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

 July 18, 1908, Dodds (D371). 



