FRESH WATER ALG-t 



"LATE III. 





AfTCR NATURE BV DR M C WOOO 



T. StNCtAlR L SOK. ^Mll.AOeLPHIA. 



Fig. 1. CYLINDROSPERMUM FLEXUO- 

 SUM 

 ■• 2. SPH/tROZYGA SUBRIGIDA. 



Fig 3. S, POLYSPERMA, 

 •• 4. GLOIOTRICHA INCRUSTATA 



Fig. &. CHLOROCOCCUS. 

 " 6. NOSTOCHOPSIS LOBATUS. 

 " 7. PROTOCOCCUS. 



