PLATE XVI. Part of a cell of Chlamydomonas showing the extensive use of membranes for the cell 

 boundary (pm), the nuclear envelope (ne), the chloroplast envelope (ce), the chloroplast lamellae or 

 discs id), mitochondrial outer membranes and cristoe (at m), the Golgi complex (g), smooth-surfaced 

 (ss) and rough-surfaced {rs) elements of the endoplasmic reticulum, and for other organelles as yet 

 unidentified. The paucity of chloroplast lamellae corresponds to the small amount of chlorophyll 

 present in this mutant cell. 80,000 X- (Courfesy of R. Soger and G. E. Palade.) 



