Xylem. Light micrograph of xylem vessels in a pine branch, viewed in longitudinal section. Xylem tissue is responsible for the upward transport of water and solutes in the plant, from the roots into the stem and leaves. As here these elongated vessels may be reinforced with spiral bands. Between some of these conducting vessels can be seen bubbles of air. In mature woody plants, xylem makes up the bulk of vascular tissue in stems and branches. Magnification: x160 at 35mm size.
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