Rhubarb leaf, light micrograph

Rhubarb leaf, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Rhubarb leaf. Polarised light micrograph of a longitudinal section through a rhubarb (Rheum sp.) leaf. The dark blue structure is a vascular bundle, which contains cells that transport water and carbohydrates around the plant. Within the parenchyma tissue (light blue) are clusters of crystals of calcium oxalate, which is poisonous if consumed in large quantities. Magnification: x100 when printed at 10 centimetres wide.

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Keywords: biological, biology, blue, botanical, botany, calcium oxalate, crystal, crystals, flora, inedible, leaf, light micrograph, light microscope, longitudinal section, nature, parenchyma, plant, plant anatomy, poison, poisonous, polarised light micrograph, polarized, rheum sp., rhubarb, sectioned, toxid, toxin, vascular bundle

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