Pine needle, light micrograph

Pine needle, light micrograph

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Credit: STEVE LOWRY/SCIENCE PHOTO LIBRARY

Caption: Light micrograph of a cross section through a pine (Pinus subgenus Pinus) needle, or leaf. The outer epidermal layer is covered by a thin cuticle (pale blue). Regularly spaced stomata are present on both the upper and lower surfaces of the leaf. A ring of 12 evenly spaced resin canals are located within the mesophyll layer. A layer of endodermis surrounds transfusional tissue, which in turn contains two vascular bundles composed of phloem (lower layer of smaller cells) and xylem (upper layer). Magnification: x40 at 10cm wide.

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Keywords: biological, biology, botanical, botany, epidermis, flora, gymnosperm, leaf, light micrograph, mesophyll, microscope, microscopic, microscopy, nature, needle, phloem, pine, pinus, plant, plant anatomy, resin canal, stomata, tree, xylem

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