Sunflower stem, light micrograph
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Sunflower stem, light micrograph
Sunflower stem. Light micrograph of a section through a young stem from a sunflower (Helianthus annuus), showing one of the many vascular bundles. The outer stem is covered with a thin epidermis (dark blue). Under the epidermis is a layer of flexible collenchyma (dark blue) for support. The cortex and pith is composed of parenchyma tissue (light blue). The vascular bundles have an outer layer of sclerenchyma tissue (crimson). Next is the phloem (dark blue) with phloem tubes, parenchyma and companion cells. Then the xylem (red) and at the end of the xylem are patches of fibres (red). In-between the phloem and xylem is the cambium (light blue). Magnification: x37, when printed 10 centimetres wide
Science Photo Library features Science and Medical images including photos and illustrations
Media ID 6339811
© DR KEITH WHEELER/SCIENCE PHOTO LIBRARY
Bundles Cambium Cell Biology Collenchyma Companion Cells Cortex Cytological Cytology Dicot Dicots Dicotyledon Dicotyledons Epidermis Fibre Fibres Helianthus Annuus Histological Histology Layer Layers Microscopy Parenchyma Tissue Phloem Pith Sieve Tubes Stain Stained Stem Structural Structures Sun Flower Tissue Vascular Bundle Xylem Young Cells Light Micrograph Light Microscope Section Sectioned
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