LEC 18 - Lecture 2/6 Vascular Plants II Microphylls and...

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1 Lecture 2/6: Vascular Plants II • Microphylls and megaphylls • Overview of • vascular plant clades • Case study: whisk fern placement • Life cycle innovations: heterospory Two difft leaf types Overview of plant clades with particular attention to leaf types Can we use this leaf information to correctly infer a phylogenetic tree End with heterospory - introduced to in lab, but need to go over as it will be important from here on 2 Misleading! megaphylls arose more than once megaphyls Megaphyls,
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3 Which statement about vascular plants is false? a. Some vascular plants have swimming sperm. b. Vascular plants form a monophyletic clade. c. Vascular plants do not make gametophytes. d. Vascular plants have a dominant sporophyte phase. 4 Lecture 2/6: Vascular Plants II • Microphylls and megaphylls • Overview of vascular plant clades • Case study: whisk fern placement • Life cycle innovations: heterospory Leaves - gathering light, and CO2 Most efficient shape is a flat plane 2 kinds of leaves - microphyll - key feature - single vascular trace - one theory that sterilization of sporangia, see it in Lycophytes second kind of leaf is megaphyll - multiple veins - unequal split, one branch is dominant, that develops by more splitting, then flattening and webbing - filled in between the branches - this is hypothesis and the fossil record shows some intermediate stages Let us look at the vascular plant clades
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5 Vascular tissue Sporangia Sporangium Microphyll Lycopodium (club moss) Microphylls: leaves with a single vein Overtopping Adiantum (fern) Webbing Planation Microphylls Megaphylls 6 Misleading! megaphylls arose more than once megaphyls Megaphyls,
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7 Which statement about megaphylls is false ? a. They have appeared more than once in evolutionary history. b. They are leaves. c. They possess a single vascular strand. d. Overtopping probably played a role in their evolution. e. Seed plants have them. 8 Lecture 2/6: Vascular Plants II • Microphylls and megaphylls Overview of vascular plant clades • Case study: whisk fern placement • Life cycle innovations: heterospory
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9 Reconstruction of a Rhyniophyte no none + Rhyniophytes Roots Leaves Dichotomous Branching Only fossils - reconstruction 10 28.18 Psilotum flaccidum : A Whisk Fern no microphylls
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This note was uploaded on 04/19/2009 for the course BIS BIS 2C taught by Professor 3differentprofs during the Winter '09 term at UC Davis.

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LEC 18 - Lecture 2/6 Vascular Plants II Microphylls and...

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