Lecture_10_27_Plants4

Lecture_10_27_Plants4 - Lecture 10/26: Vascular Plants II...

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Lecture 10/26: Vascular Plants II Microphylls and megaphylls Overview of vascular plant clades Case study: whisk fern placement Case study: molecular analysis of leaf homoplasy Life cycle innovations: heterospory
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Figure 28.10 Microphylls Vascular tissue Sporangia Sporangium Microphyll Lycopodium (club moss) Microphylls: leaves with a single vein
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Figure 28.10 Megaphylls Overtopping Adiantum (fern) Webbing • Megaphylls: leaves with multiple veins • Three steps of megaphyll evolution Overtopping Planation--branches in a 2D plane Webbing Planation
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Lecture 10/26: Vascular Plants II Microphylls and megaphylls Overview of vascular plant clades Case study: whisk fern placement Case study: molecular analysis of leaf homoplasy Life cycle innovations: heterospory
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Reconstruction of a Rhyniophyte no none yes Rhyniophytes Roots Leaves Dichotomous Branching
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28.18 Psilotum flaccidum: A Whisk Fern no microphylls yes Whisk Ferns no none yes Rhyniophytes Roots Leaves Dichotomous Branching
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28.17 Horsetails Reproductive Shoot yes microphylls no Horsetails no microphylls yes Whisk Ferns no none yes Rhyniophytes Roots Leaves Dichotomous Branching vegetative shoot
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Photo 28.25 Whorl of fused leaves on stem of horsetail Equisetum hiemale .
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Figure 28.16
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Lecture_10_27_Plants4 - Lecture 10/26: Vascular Plants II...

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