« 



'«;■- 



py 



as- 



b^ 



Section through Chlorella pyrenoidosa show- 

 ing the cell wall, the cupshaped chromato- 

 phore with its pyrenoid (py) and the cell nu- 

 cleus (n), X 57,000. Inset: The pyrenoid, 

 X 75,000 (both after Albertson and Leyon, 

 Expii Cell Research, 7, 288, 1954). 



