12 



Livingston : Chemical stimulation of a green alga 



fewpalmella cells remain. Filaments are inhibited, thus giving the 



palmella form, in strengths from 



'/ 



The palmella form in solutions of this salt is usually somewhat 

 bluish green in color. There is an acceleration of zoospore pro- 



duction at ;f/i,ooOjOOO.. 



^/ 



® 



(£) 



10 



Figure 8. Palmella from «/io,ooo Co(N03)2. 



Figure 9, 

 Figure io. 



Palmella and zoospores from 5k/i ,000,000 CoSO 

 Filaments from «/l,ooo,ooo CoSO^. 



Figure ii. Palmella from «/i,ooo,ooo Cu(N03)2. 



{Fig, II illustrates typical pa 

 tion.) 



//. Copper sulfate (CuSO 

 the nitrate. {Fig^ 12 shows 1 

 000,000, concentration,) 



The sulfate again agrees with 

 >pearance of palmella in a 



