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PlantKingdom213-page9 - • The eustele found in most seed...

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Introduction to the Plant Kingdom - 9 Review of Evolutionary Features used in Classifying Vascular Plants Vascular Patterns in Stem and Leaf Stems progress in evolution from a protostele to the siphonostele and eustele vascular patterns. The protostele is a solid core of stem vascular tissue from which leaves diverge without leaving a vascular gap in the stem. The siphonostele has a central pith surrounded by a cylinder of vascular tissue. The vascular strands that go to leaves (the leaf traces) In some plants that have siphonosteles result in a leaf gap of parenchyma cells.
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Unformatted text preview: • The eustele, found in most seed plants, is comprised of discrete vascular bundles surrounding the pith. Leaf trace gaps are found in the eustele. • Microphylls vs. Megaphylls for leaves • Microphylls contain one vascular strand, probably evolving from small projections, or enations located along stem tissue. • Megaphylls have a branching system of veins, and probably evolved from side branches of stems, in a webbing process, in which tissue containing chlorophyll filled in spaces between nearby branches. Microphylls Megaphylls...
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