ALGAE FROM LAKES IN THE NORTHEASTERN PART 



OF NORTH DAKOTA 



GEORGE T. MOORE 



Director of the Missouri Botanical Garden 

 Engelmann Professor of Botany in the Henry Shaw School of Botany of 



Washington University 



AND NELLIE CARTER 

 Research Assistant, Missouri Botanical Garden 



In the Annals of the Missouri Botanical Garden, Vol. 4, Number 

 4, page 293, 1917, there was published a preliminary list of algae 

 from Devils Lake, North Dakota. Since this list appeared 

 there have been received from time to time, through Professor 

 R. T. Young, Director of the State Biological Station, collections 

 of algae, not only from Devils Lake proper, but also from many 

 lakes in the surrounding regions. Because of the conditions 

 under which many of these algae grow and the discovery of several 

 forms which are extremely rare, or reported for the first time from 

 this country, it seems desirable to publish from these more exten- 

 sive samples a supplementary account of the algae from this par- 

 ticular section of North Dakota. 



The list on p. 397 does not necessarily include all the species 



mentioned in the earlier list, and therefore in any consideration 



of the algal flora of this region it should be borne in mind that, 



since the preliminary list contains forms not appearing in the 



list published herewith, the two should be considered together 



in order to give the most comprehensive view of the algae from 

 this region. 



On pp. 395-396 the species from the area under consideration, 

 both those observed in the present investigation and those con- 

 tained in the earlier list, have been brought together with the ob- 

 ject of contrasting the flora of the " freshwater ' ' and " alkaline" 

 lakes, according to the classification of the waters given above by 

 Dr. Young. The number of " freshwater " and "alkaline " lakes 



Ann. Mo. Bot. Gard., Vol. 10, 1923 



(393) 



