gave the term parenchyama for the pithy part.
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Pith, or medulla, is a tissue in the stems of vascular plants. Pith is composed of soft, spongy parenchyma cells, which store and transport nutrients throughout the plant. ... In trees pith is generally present in young growth, but in the trunk and older branches the pith often gets replaced - in great part - by xylem.
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The term parenchyma was coined by English botanist and plant physiologist Nehemiah Grew. Grew stated that every plant organ had two parts, a ligneous (woody) and a pithy part composed of undifferentiated cells with air spaces between them.
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