PL 50. 



a 



b c 



Chlorocystis Cohni 



d 



Scotinosphaera paradoxa 



a 



Endosphaera biennis 



Schizochlamys gelatinosa 



Lagerheimia wratislaviensis 



m 



Lagerheimia genevensis 



VI. CHLOROPHYCE^E 2 Protococcales 



