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Vessel member & tracheids |
Vascular plants have two kinds of
Tracheary Elements Tracheids and
Vessel Members.
Conifers
have only tracheids. Woody
angiosperms have also
vessels.
The mature tracheids form a column of superposed,
cylindrical dead cells whose
end walls have been perforated, resulting in a continuous tube called
vessel (trachea). Tracheids are found in all
vascular plants and are the only conducting
elements in gymnosperms and ferns.
Tracheids have Pits on their end walls. Pits are not nearly as
efficient for water translocation as
Perforation Plates found in
vessel elements.
Principal characteristic of tracheids:
Compare whit:
Vessel member |
