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SlideshowReport

Tracheids in conifer wood.

Description
(a) The lignin-rich cell walls of the conducting cells called tracheids. (b) Detailed view of a portion of a tracheid that shows the thin-walled areas known as pits, each with a torus. (c) A water-filled tracheid with open pits and an air-filled tracheid with pits sealed by the flexed tori.
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