Sage stem, light micrograph

Sage stem, light micrograph

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Caption: Sage stem. Light micrograph of a section through a primary stem of a scarlet sage (Salivia splendens) plant. The outer stem is covered with a thin epidermis (green) that contains stomata. Under the epidermis, at the corners, is a layer of flexible collenchyma (blue-red) for support. The cortex is made up of parenchyma cells (round, red). Next are four large and twelve small vascular bundles. Each has an thin outer layer of phloem (green) with sieve plates and companion cells, and an inner xylem (red), with large vessels and small-celled woody parenchyma tissue (green). In-between is a thin layer of cambium. The centre of the stem is a pith of parenchyma (green), most of which has broken, leaving a hollow. Magnification: x5 when printed 10 centimetres.

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Keywords: angiosperm, angiosperms, biological, biology, botanical, botany, bundles, cambium, cell, cell biology, cells, close-up, collenchyma, companion cells, cortex, cytological, cytology, detail, dicot, dicots, dicotyledon, dicotyledons, epidermis, histological, histology, hollow, light micrograph, light microscope, microscopy, parenchyma tissue, phloem, pith, plant, plants, primary stem, sage, salivia splendens, scarlet sage, section, sectioned, sieve plate, sieve plates, stain, stained, stomata, structural, structure, structures, tissue, vascular bundle, vascular tissue, vessel, vessels, xylem

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