Fig. 5: Sectional view of the fine structure of chloroplast lamellae according to Steinmann and Sjostrand (1955). Fig. 6: Sectional view of fine structure of chloroplast lamellae according to Hodge, McLean and Mercer (1955). Fig. 7: Sectional views of development of the chloroplast from a proplastid; after Granick (1961). Fig. 8: 3-dimensional view of the fine structure of chloroplast lamellae according to Weier and co-workers (1963). fr = fretwork; gr = granum. Fig. 9: Longitudinal section of a chloroplast from maize from an electron micrograph made by Abbott Laboratories. gr = grana; st = stroma; od = osmiophilic droplet; bm = outer membrane.