LM of a section through a lime tree stem

LM of a section through a lime tree stem

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Credit: SIDNEY MOULDS/SCIENCE PHOTO LIBRARY

Caption: Light micrograph of a transverse section through a three year old lime tree (Tilia sp.) stem, showing the pith (centre) & surrounding xylem (pink). The pith forms the central core of the young stem and is composed of parenchyma tissue. The xylem is composed of vertical, tube-like cells (seen here in cross-section) which conduct the sap upwards from the tree roots. It contains horizontal vascular rays (green lines radiating out from the pith), which supply it with nutrients. New xylem cells are laid down beneath the bark as the tree grows & the cells near the centre gradually become blocked by resins, taking on a purely structural function. Magnification: x36 at 35mm size.

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Keywords: botany, light micrograph, nature, pith, plant, plants, rays, vascular, vascular ray, xylem

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