J.C. REVY, ISM / SCIENCE PHOTO LIBRARY J.C. REVY, ISM / SCIENCE PHOTO LIBRARY
Bryony stem. Light micrograph of a transverse (cross) section through the stem of a bryony plant, Bryonia sp. This is a typical dicotyledon stem. At upper left is the outer epidermis (black) and a region of thick-walled collenchyma cells (gold) that support the stem. Five large vascular bundles are seen (centre) embedded in parenchyma cells (pink) of the cortex of the stem. Each vascular bundle contains large xylem vessels (gold) which serve to conduct water; external to the xylem is nutrient conducting phloem (pink). At the outer edge of each vascular bundle is scleren- chyma tissue (orange) which supports the vascular bundles. Magnification: x9 at 35mm size.
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