RM
Sweet potato stem, light micrograph
Sweet potato stem. Light micrograph of a transverse section through part of a sweet potato (Ipomoea batatas) stem. At bottom is a large area of pith, consisting of parenchyma cells. Above this are xylem (red) and then phloem (blue) cells, which transport water and carbohydrates around the plant respectively. Next is a very thin ring of parenchyma cells (dark pink) and then collenchyma tissue (blue and black), before the outer layers of epidermis and cuticle. Magnification: x100 when printed at 10 centimetres wide.
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