HOW TO KNOW THE FRESH-WATER ALGAE 



221a (214) Filament of cells in 1 series, at least in the basal portion. 



222 



221b Filament of cells in more than 1 series, at least in the upper 



.239 

 portion *"" 



222a Filament of cells in 1 series in the basal portion, of several series 

 in the upper. Fig. 157 SCHIZOMERIS 



Fig. 157. Schizomeris Leibleinii Kuetz. a, base 

 of filament and uniseriate portion; b, multi- 

 seriate upper portion of filament. 



There is but 1 species in this genus, a 

 plant which is uncommon but widely dis- 

 tributed over the world. The filaments are 

 relatively large, when fully developed, and 

 rather coarse. They occur in dark green 

 clumps in standing water and have the macro- 

 scopic appearance of a growth of Spirogyra 

 (Fig. 147) or of some large Ulothrix (Fig. 167), 

 but unlike these genera, Schizomeris fila- 

 ments separate easily and can be seen in- 

 dividually within the tuft. There is some evi- 

 dence that the plant . favors water rich in 

 nitrogenous matter and is to be looked for 

 in shallow water of lakes near the entrance 

 of drains, effluent of sewage treatment plants, 

 etc. 



Figure 157 



222b Filaments of cells in 1 series throughout 



223 



223a Chloroplast a parietal network, usually close and dense, cover- 

 ing the entire wall; pyrenoids many and conspicuous 224 



223b Chloroplast otherwise; pyrenoids few or lacking 



225 



101 



