The Pith reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Pith

Pith is a light substance that is derived from certain vascular plants. It consists of parenchyma cells, and is located within the center of the stem or root. It is encircled by a ring of vascular bundles. Mature woody structures typically do not possess a pith, because their secondary growth (in width), soon outpaces the pith and replaces it with woody tissue. Young structures within a tree may still have pith, even while the trunk and major branches no longer have any at all.

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