Perforation plate | botany | Britannica (original) (raw)

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cell structure in angiosperms

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  In angiosperm: Organization of the vascular tissue
  …end walls are modified into perforation plates, an area or areas in which there is no shared wall material or membrane. Vessel elements join to form continuous vessels. The perforations are much larger than those of the bordered pits of tracheids and are of four types: scalariform (slitlike), foraminate (circular),…
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xylem

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  In xylem
  …secondary cell walls, known as perforations. Water flows relatively unimpeded from vessel to vessel through these perforations, though fractures and disruptions from air bubbles are also more likely. In addition to the tracheary elements, xylem tissue also features fibre cells for support and parenchyma (thin-walled, unspecialized cells) for the storage…
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