I 



ALGAL FLORA OF THE MISSOURI BOTANICAL GARDEN. 27 



HABITATS. 



habitats observed in this study are indicated 



purposes of discussion 



may be resolvec 



I. Moist earth. 

 II. Water. 



Running. 



a. Waterfalls. 



b. Rocky stream beds, e. g. , Arboretum stream. 



c. Smooth stream beds, e. g., Arboretum stream in part. 



Waterfall 



Quiet 



a. Ponds or pools with no outlet, e. g. , Crescent pool. 



Arboretum pool and Nelumbium pools. 



b. Ponds or pools with outlet, e. g. , Fountain pond lagoon. 



Having viewed the general problem of habitat characters 

 it is in order to consider the particular conditions in the loca- 

 tions studied which for convenience may be designated as 

 Fountain pond, Waterfall stream, Lagoon, Arboretum 

 stream, Arboretum pond, Nelumbium pools, Nymphaea pool, 

 Crescent pool. Their location in the garden may be seen in 



The first four in the series are 

 connected in the order named and as may be seen lie respect- 

 ively in the lowest part of the tract between rolling elevations 

 which drain into them. The surrounding territory is grassy 

 with the exception of the Arboretum stream where the herb- 



map 



more 



m 



dissemination 



water of anything which grows in the first of the series. 



Some of the more obvious habitat characters in con- 

 formation to which plants arrange themselves in groups 

 may be mentioned. The amount of moisture in the 

 earth depends on precipitation, air currents and heat, of 

 which the two latter affect evaporation from the earth; also 

 level of water table and type of soil whose greater or less 



porosity affects the water holding and retaining power. 



