Section through a Yew tree twig

Section through a Yew tree twig

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Caption: Light micrograph of a transverse section through a yew tree (Taxus sp.) twig, showing the pith (green & brown, bottom right), xylem (pink, centre) and phloem (green, upper left). The pith forms the central core of the young stem and is composed of parenchyma tissue. The xylem is composed of vertical, pillar-like cells (seen here in cross- section) which conduct the sap upwards from the tree roots. It is crossed by horizontal vascular rays (green) which supply it with nutrients. The phloem is a spongy layer, lying just underneath the bark, which is responsible for distributing the carbohydrates produced by photosynthesis in the leaves. Magnification: x50 at 35mm size.

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Keywords: botany, gymnosperm, light micrograph, nature, phloem, pith, plant, plants, rays, taxus sp., vascular, vascular ray, xylem, yew tree

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