Horsetail stem

Horsetail stem

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Caption: Horsetail stem. Coloured scanning electron micrograph (SEM) of the stem of a horsetail (Equisetum giganteum). Carbon dioxide can pass into the stem through the stoma (pore, lower centre) in its protective outer layer, the epidermis (grey). This gas is needed for photosynthesis, the production of carbohydrates using sunlight, which only occurs in the plant's stem. Horsetails (division Sphenophyta) are vascular plants with a hollow jointed stem and scale-like leaves. E. giganteum, which grows in the American tropics, can reach over 9 metres in length. Magnification: x660 at 6x7cm size.

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Keywords: biology, botany, epidermis, equisetum giganteum, horsetail stem, nature, plant, pteridophyte, pteridophytes, scanning electron micrograph, sem, sphenophyta, stomata, tropical american

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