DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Squash stem. Light micrograph of a longitudinal radial section through the stem of a squash (Cucurbita sp.) plant, showing the sieve tubes and plates (blackish-red) of the phloem in a vascular bundle. Alongside the phloem are companion cells (long thin), which store food. Magnification: x37 when printed 10 centimetres tall.
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