BLG 144 Lecture Notes - Lecture 7: Green Algae, Paleobotany, Charophyceae
Document Summary
First lineage = rise to red and green algae. A) formation of colonies by individual organisms. B) repeated nuclear division but no cytoplasmic division, thallus > super cell cell with multiple nucleus. Evidence of land plant evolution: morphological support. Three morphological differences among land plants: non vascular plants: lack specialized cells to conduct water and nutrients, provide. Support: seedless vascular plants: embryo not protected by seed, seed plants: embryo protected by seed, fossil record. Earliest land plant fossils (475 mya) contained waxy cuticle layer, spores, and sporangia. Silulirian devonian explosion = 2nd major land plant fossil record. Carboniferous period: 3rd major land plant fossil record interval, many large seedless vascular plants ,large coal deposits. Gymnosperms: 4th major interval, first seed plants, seed bearing woody plants, naked. Angiosperms: 5th major interval, first flowering plants with enclosed seeds: molecular support. Single common ancestor to green algae and land plants.
