ALGAL FLORA OP THE MISSOURI BOTANICAL GARDEN. 43 



SC ENEDESM ACEAE. 



Nympha 



Mar 



Actinastrum Hantzschii Lagerh. 

 June. Multiplication takes place by longitudinal division of 

 cells. Observed Apr. 6. The size of the individual found 



m that riven bv De Toni, Han 



Chodat 



The dimensions of those found 



in the Garden are 2.4-8.2/1 X9-16>*.' Colony 19.2-32^ 



diam 



kistrodesmus / 



Waterfall stream. Nelumbium pools. 

 Abundant. Sept. to Dec., Mar. through 



Fountain pond, 

 rymphaea pool. 



kistrodesmus falcatus var. spiralis (Turn.) West. 1 



Ravhidium volvmorvhum 



m 



kistrodesmus contortus 



phaea pool. April-June. Raph 

 contortum (Thur.) Wolle, and 

 Thur., according to the descriptions given in Wolle (Fresh- 

 water Algae of U. S. 198. pi. CLX., seem to be synonymous 

 with West's Ankistrodesmus falcatus var. spiralis. Thuret's 

 description antedates the others here mentioned. 



Ankistrodesmus falcatus var. mirabilis West. Nelumbium 

 pools. Waterfall stream. Nymphaea pool. Sept. to Dec, 



Apr., June. 



Ankistrodesmus falcatus var. tumidus West. Nelumbium 



pools. Fountain pond. 



stream. Nymphaea pool. 



Oct., May. Rare. 



Coelastrum 



bicum Nag. Fountain pond. Common 



Sept. and Oct. Rare. 



form 



responds closely with Lemaire's figure and descriptions of 



cornutum 



from C. cubicum 



lastrum microsporum Nag. Fountain 



d 



Quiet 



Waterfall stream. Common. Sept. to Dec. 



aenum Ehrenberaianum 



m 



May. Colo- 



Most abundant near the floor of the pond. Apr., 

 nies observed here consist of 4-16 cells. Diam. o 

 A*;cells rather uniform in size, measuring ab< 

 The cup-shaped chrornatophore has a red eye spot. This 



4 



form 



rresponds closely in size to the 



wenum 



