SCIENTIFIC PAPERS 



THE ALGAL FLORA OF THE MISSOURI BOTANICAL 



GARDEN. 1 



BY ADA HAYDEN. 



INTRODUCTION 



While holding a research fellowship in the Henry Shaw 

 School of Botany at the Missouri Botanical Garden an oppor- 

 tunity was afforded to investigate the algae found 



ponds and 



work was done 



under the direction of Professor G. T. Moore and the deter- 

 mination of the species in the systematic list, based on stand- 

 ard taxonomic works and exiccatae, has been corroborated by 

 Professor Moore. The photographs of the habitats were made 



Mr. Emil 



marked b} 

 :epared by 



Hus 



Any habitat study of plants involves ecological principles. 

 In the present consideration of the garden algae none of the 



main 



may 



ducted 



its source is the Mississippi and though passed through the 

 purification process its chemical value as regards mineral 

 content (U. S. Bull. Bur. PI. Ind. No. 64) is not essentially 



from 



It 



is seldom, however, that such a variety of types are found in 

 such a limited area. This may be accounted for by the fact 



1 Abstracted from a thesis presented to the Faculty of Washington 

 University, in candidacy for the degree of Master of Science, June, 



1910. 



(25) 



