Pumpkin metaxylem tracheids, light micrograph
Light micrograph of a longitudinal section through the stem of a pumpkin plant (Cucurbita pepo) stained with a mixture of Alcian Blue and Safranine O. Metaxylem tracheids with pit type cell thickening (red) are visible. Magnification: x300 when printed 10cm x 10cm., by MAGDA TURZANSKA / SCIENCE PHOTO LIBRARY
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