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Xylem
Xylem tissue is a feature of higher vascular plants (Filicinophyta,
Coniferophyta, and Angiospermaphyta). It developed as plants became less
dependent on water and lived in drier environments. It is the tissue
which conducts water (and dissolved nutrients) from the soil to the leaves.
Before this, more primitive plants like the mosses and liverworts had to
(and still do) rely heavily on surface water to be absorbed through the
leaves.
First xylem starts as living cells which over time elongate and lose
their cytoplasm and then die to become a hollow fluid filled tube.
Xylem vessels
can exist in several forms as shown on the diagram.
Xylem on Wikipedia
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