Abstract
After receiving a dose of 3 krads, young Osmunda prothalli show no further cell division or growth. Two to six weeks later the prothalli begin to yellow and eventually die. Ultrastructural changes within the chloroplast are visible 2 hours post-irradiation, beginning with the appearance of membrane free areas with clear zones containing a network of fine fibrils typical of chloroplast DNA. Numerous starch grains then appear in the areas previously containing fibrils in the first few days. The starch grains increase in size until physical rupture of the chloroplast envelope takes place approximately 2 weeks later. During this time there may also be a large accumulation of lipid within the cells.
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