Vascular Systems in plants

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Vascular Systems in plants an introduction to
plant anatomy
Cells Tissues. Organization into structural
entities.
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Endodermis
Pericycle
primitive vascular plants
Lycopodium gnidiodes
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primitive vascular plants
Lycopodium claviatum
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primitive vascular plants
Psilotum has no leaves or roots!
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primitive vascular plants
Trabeculae are modified endodermal cells
pericycle surround vascular bundle.
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primitive vascular plants
Rumohra
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Encephalartos. Gymnosperm
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Araucaria (Gymnosperm)
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Cucurbita
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Zea mays Monocotyledon. (Atactostele) highly
advanced
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Nymphoides stem
Hydrophytes have a reduced xylem component in the
vascular system. Here, only a few XYLEM VESSELS
are visible. The phloem on the other hand appears
to be well-developed, and consists of sieve tubes
companion cells and phloem parenchyma. I
Several ASTROSCLERIEDS can be seen interspersed
with the ground parenchyma
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Ligustrum (Privet) Leaf
Advanced foliage leaf, dicotyledon. Note
mesophyll divided into upper palisade and lower
spongy layer. Smaller veins (like these) are
embedded within the mesophyll, between palisade
and spongy layers. These are MINOR veins
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Zea mays leaf
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The pine leaf
sunken stomate
In Gymnosperm leaves such as the pine leaf, the
vascular system is reduced to the central region.
You should be able to see two vascular bundles in
this example. The xylem is composed of TRACHEIDS
and the phloem of SIEVE CELLS and ALBUMINOUS
CELLS.
endodermis
vascular bundle
endodermis
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