CHLOROPLASTS 



259 



Fig. : 3 1 . Chloruplasts ot tobacctj leaves in the electron microscope (t rom !■ rey-\\ yssling 

 and MunLETHALER, 1949a). a) Chloroplast membrane; b) grana; c) myelin covering grana 

 and globular macromolecules of disintegrated stroma; d) intact granum and layers of an 



overturned granum. 



