Vascular Systems in plants an introduction to plant

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Vascular Systems in plants – an introduction to plant anatomy Cells & Tissues. Organization

Vascular Systems in plants – an introduction to plant anatomy Cells & Tissues. Organization into structural entities.

Endodermis Pericycle primitive vascular plants Lycopodium gnidiodes

Endodermis Pericycle primitive vascular plants Lycopodium gnidiodes

primitive vascular plants Lycopodium claviatum

primitive vascular plants Lycopodium claviatum

primitive vascular plants PROTOXYLEM PHLOEM Detail of a cross section of the stem of

primitive vascular plants PROTOXYLEM PHLOEM Detail of a cross section of the stem of Psilotum has no leaves or roots!

primitive vascular plants XYLEM PHLOEM TRABECULA Trabeculae are modified endodermal cells – pericycle surround

primitive vascular plants XYLEM PHLOEM TRABECULA Trabeculae are modified endodermal cells – pericycle surround vascular bundle.

primitive vascular plants PERICYCLE PHLOEM ENDODERMIS Rumohra

primitive vascular plants PERICYCLE PHLOEM ENDODERMIS Rumohra

PHLOEM FIBERS PROTOPHLOEM Encephalartos. Gymnosperm

PHLOEM FIBERS PROTOPHLOEM Encephalartos. Gymnosperm

PHLOEM RAY TRACHEIDS CAMBIUM PHLOEM Araucaria (Gymnosperm)

PHLOEM RAY TRACHEIDS CAMBIUM PHLOEM Araucaria (Gymnosperm)

EXTERNAL PHLOEM Cucurbita INTERNAL PHLOEM

EXTERNAL PHLOEM Cucurbita INTERNAL PHLOEM

Zea mays Monocotyledon. (Atactostele) highly advanced

Zea mays Monocotyledon. (Atactostele) highly advanced

Nymphoides stem Hydrophytes have a reduced xylem component in the vascular system. Here, only

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 welldeveloped, and consists of sieve tubes companion cells and phloem parenchyma. I Several ASTROSCLERIEDS can be seen interspersed with the ground parenchyma

Ligustrum (Privet) Leaf Advanced foliage leaf, dicotyledon. Note mesophyll divided into upper palisade and

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

Zea mays leaf

Zea mays leaf

The pine leaf sunken stomate endodermis m biu m ca endodermis In Gymnosperm leaves

The pine leaf sunken stomate endodermis m biu m ca endodermis 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. vascular bundle