26-Plants - rigin and Early Evolution rigin and Early...

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Unformatted text preview: rigin and Early Evolution rigin and Early Evolution of Plants of Plants Bryophytes (Moss) Tracheophytes (Fern) ryophytes Tracheophytes BRYOPHYTES BRYOPHYTES PLANTS PLANTS WITHOUT VASCULAR TISSUE WITHOUT VASCULAR TISSUE Liverworts Hornworts Mosses Mosses Mosses Sphagnum (Peat Moss) Polytrichum (Hairy-Capped Moss) Higher Mosses TRACHEOPHYTES TRACHEOPHYTES PLANTS PLANTS WITH VASCULAR TISSUE WITH VASCULAR TISSUE Non-Seed Vascular Plants Gymnosperms Angiosperms NON NON-- SEED SEED ASCULAR PLANTS ASCULAR PLANTS EVOLUTION OF EARLY EVOLUTION OF EARLY TRACHEOPHYTES TRACHEOPHYTES Psilotophytes Lycopods Horsetails Ferns EARLY DEVONIAN FLORA (400 Million Years Ago)---------------- The Devonian Period Was the Big Bang Of the Plant Kingdom PLANT FEATURES FIRST PRESENT IN THE DEVONIAN (1) Roots (2) Leaves (3) Wood (4) Trees and the First Forests (5) Seeds---------------------- Only Major Group of Plants not Present by End of Devonian: Angiosperms (Flowering Plants) with Flowers & Fruits Cooksonia caledonica COOKSONIA Oldest Definite Plant Fossils (Mid-Silurian to Early Devonian) ! Stems only, no roots or leaves ! Dichotomous branching ! Tiny herbs with no wood ! Sporangia (structures in which spores are produced) terminal on the branches RHYNIOPHYTES Aglaophyton major Sporophyte Reconstruction Spore Tetrads In Sporangium Germinating Spore Stomate on Stem Male Gametophyte with Antheridia ( Lyonophyton rhyniensis ) Sperm Released from Antheridium Stem Sporangium Stem Water Conducting Cell LYCOPODS LYCOPODS Lycopodium (Club Moss) Selaginella (Spike Moss) Isoetes (Quillwort) CARBONIFEROUS COAL SWAMP (300 Million Years Ago) Tree Lycopods Lepidodendron (Scale Tree) Habit Stump Cast ( Stigmaria ) Leaf Bases on Bark Leaf ( Lepidophyllum ) Reproductive Cone ( Lepidostrobus ) ! Tall trees (over 100) ! Wood HORSETAILS HORSETAILS Equisetum Calamites FERNS FERNS Tree Fern Maiden-Hair Fern ( Adiatum ) FERNS Braken Fern ( Pteridium ) Maidenhair Fern ( Adiantum ) Tree Fern Water Fern ( Azolla ) SPERMATOPHYTES...
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This note was uploaded on 11/22/2011 for the course BIOLOGY 190a taught by Professor Staff during the Fall '11 term at UMass (Amherst).

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26-Plants - rigin and Early Evolution rigin and Early...

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