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Amphycribral Vascular Bundle of a Fern Rhizome-Pterídium aquilinum Big cells with red cell wall are tracheids. They serve in the transport of water.
Around the xylem there are xylem parenchyma and phloem cells. A single row layer of small cells (with red content) located circumferentially is endoderm.
Anatoly Mikhaltsov
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