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Cross section of a
stem of
Astrophytum myriostigma
The stele is the whitish ring of
vascular
bundles
in the centre |
Stele of
Echinocactus grusonii
whit cortical
bundles branching
off from stele bundles. |
The stele is the central
cylinder of conductive tissue,
inside the cortex, in the
stem or
root of a
vascular plant,
consisting of the vascular tissue together with supporting
tissues and its associated
ground tissues. The
vascular bundles in
the stele are arranged in a ring. Although vascular tissues
consist of two types of transport tissues,
xylem and
phloem, diverse arrangements
of vascular tissues within the bundles and of vascular bundles
in the stele evolved in different vascular plants
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