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siphonostele
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Botanical diagram showing various stem structures in ferns, including cross-sections of protostele, siphonostele, dictyostele, and polycyclic dictyostele, with labeled tissues such as cortex, pith, xylem, and phloem. The image also depicts a tree fern with a labeled trunk and horizontal rhizome, and includes examples of root types: monarch, diarch, and triarch.
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siphonostele: Media

plant structure
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fern stem anatomy
Stem structures in ferns.
Drawing by M. Pahl