non-seed plants

non-seed plants - Charophycean ancestor Trends in plant...

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Unformatted text preview: Charophycean ancestor Trends in plant complexity: non-seed plants seed plants vascular plants land plants Decreasing need for liquid water for fertilization Reproduction by flowers Dispersal by seeds Presence of vascular tissue Basic land plant attributes Charophyceans Bryophytes Pteridophytes Gymnosperms Angiosperms (mosses, etc.) (ferns, etc.) (conifers, etc.) (flowering plants) Increasing dominance of sporophyte generation Charophycean ancestor Charophyceans Bryophytes Pteridophytes Gymnosperms Angiosperms (mosses, etc.) (ferns, etc.) (conifers, etc.) (flowering plants) Trends in plant complexity: non-seed plants seed plants vascular plants land plants Reproduction by flowers Dispersal by seeds Presence of vascular tissue Basic land plant attributes Trends in plant complexity: Bryophytes Bryophytes have the basic suite of land plant attributes: apical meristems multicellular, dependent embryos alternation of generations multicellular gametangia walled spores Three phyla (divisions): Hepatophyta (liverworts) Athocerophyta (hornworts) Bryophyta (mosses) Trends in plant complexity: Bryophytes Bryophytes have the basic suite of land plant traits: apical meristems multicellular, dependent embryos alternation of generations multicellular gametangia walled spores Three phyla (divisions): Hepatophyta (liverworts) Athocerophyta (hornworts) Bryophyta (mosses) Bryophytes are very ancient; probably were the first land plants (ancestral to other land plant phyla, as shown in cladograms) liverworts, hornworts are reasonably good models of how early land plants looked and functioned Trends in plant complexity: Bryophytes Bryophytes have the basic suite of land plant attributes: apical meristems multicellular, dependent embryos alternation of generations multicellular gametangia walled spores All bryophytes are small plants that are highly dependent on plenty of water. no vascular tissue (except simple forms in mosses) need to be fairly thin so all cells are close to sources of water and dissolved mineral nutrients (usually only a few cells thick) usually have no specialized supporting structure (such as lignified cell walls), so they cannot grow more than a few cm tall (a few mosses get taller) flagellated sperm that need to swim to reach the egg, so they can reproduce...
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non-seed plants - Charophycean ancestor Trends in plant...

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