Par trichard
Transition of cortex to pith. Cortex with a small package of fibers (downwards) cambium (coffee), light blue phloem and vessels of the orange xylème. W-Q
http://www.microscopy-uk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/artaug04/wdaptenia.html
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