Section through stem of Clematis

Section through stem of Clematis

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Caption: Clematis stem. Light micrograph of a transverse (cross) section through the stem of Clematis vitalba (family: Ranunculaceae). This is a typical woody dicotyledon stem. The outer cortex (brown) is strengthened with thick-walled collenchyma cells; the rest of the cortex comprises parenchyma (yellow) cells. At middle is the vascular stele bounded by a black ring of supporting sclerenchyma cells. Within the stele are 12 vascular bundles, containing phloem (black semi-circles) and xylem vessels (large hollow cells bordering the phloem). Phloem serves to conduct nutrients from leaves; xylem transports water from the roots. There is a central pith. Magnification: x7 at 35mm size.

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Keywords: botany, clematis, clematis vitalba, collenchyma, dicotyledon, light micrograph, nature, phloem, plant, plants, sclerenchyma, stem, xylem vessel

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