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SlideshowReport

A pteridophyte stem with tracheophyte adaptations for transporting and conserving water.

Description
(a) A cross-section through a stem of the pteridophyte Psilotum nudum. When viewed with fluorescence microscopy and illuminated with violet light, an internal core of xylem tracheids glows yellow, as does the surface cuticle. Surface pores known as stomata are also present. (b) Close-up of stomata.
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