PL 112. 



Closterium lunula 



Cosmarium 



turgidum 



Cosmarium 

 species 



vr^.. ':' 



Cosmarium 

 commissurale 



Cosmarium 

 punctulatum 



Cosmarium 

 furcatospermum 



Cosmarium 

 ornatum 



Cosmarium 

 Turnerii 



Closterium species 



Cosmarium laeve 



Cosmarium isthmium 



VII. CONJUGATE 



3. Desmidiacese 



