SOME DESMIDS FROM ALPINE STATIONS IN 

 COLORADO 1 



By G. H. Wailes 



Following is a list of desmids determined by the writer from 

 material submitted by Professor C. H. Edmondson of Washburn 

 College. The collections were made in the summer of 191 1 from 

 alpine stations near the Continental Divide west of Denver and 

 Boulder, Colorado. In examining this material I notice that some of 

 the American forms of desmids are slightly different from the British 

 and European; thus Euastrum verrucosum var. reductum and E. 

 bidentatum from these collections are not quite typical. Separate 

 lists are given below for the three collections. 



Summit Lake, Clear Creek County, 12,740 Feet 



Closterium parvulum Nag. 



Hyalolheca dissiliens (Sm.) Breb. 



Penium curium Breb. f. minor Wille, (1. 29 M, diam. 14 f). 



P. cylindrus (Ehrenb.) Breb. 



Euastrum occidentale West & G. S. West. 



E. ansalum Ralfs. 



E. verrucosum var. reductum Nordst. 



E. bidentatum Nag. 



Cosmarium pseudobroomei Wolle (medium-sized variety ; length about 



50ft, width nearly as much). 

 C. quadratum Ralfs. 

 C. granatum Breb. 

 C. subcrenatum Hantzsch. 

 C. hammeri Reinsch. 

 Staurastrum natalor var. crassum West. 



1 Publication of the Colorado Biological Survey, No. 1 2. 

 119 



