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Figure 1
Figure 1. Mineral localization in a 2nd year needle of Eastern white pine (Pinus strobus) from the Sudbury site, as determined by x-ray microanalysis. Micrographs illustrate the frozen, planed face of a transverse section from 1 mm behind the tip: A, secondary electron image; B, a calcium x-ray distribution image of the section in (A); C, a matching silicon x-ray distribution image of the section in (A); D, aluminium x-ray distribution image of the section in (A). All micrographs x175. Abbreviations: endodermis (en), epidermis (ep), hypodermis (hy) mesophyll (me), transfusion tissue (tr), vascular tissue (vt), xylem wall (xw).
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