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THE FERNS AND THEIR ANCESTORS
LINGERING REMNANTS OF THE COAL AGE
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abundant algae ancestors ancient appearance araucarias attained bearing borne botanical botanists branches calamites Carboniferous cells chapters climate clubmosses Coal Age coal balls coal seams cones conifers conspicuous Cretaceous cycads deposits Devonian distinctive early earth eastern Eocene evidence evolution feet ferns flora flowering plants foliage forests fossil plants fossil record frond gametophyte Garden geologic ginkgo Greenland group of plants horsetail inch Jurassic known latter leaf leaflets leaves Lepidodendron liverworts living plants Lycopodium lycopods Mesozoic microscope million mineral Miocene Missouri Bot modern mosses Oregon organs paleobotanist Paleozoic past period petrified pine plant kingdom plant remains pollen portion present preserved redwood region represented rocks roots scattered seed plants seed-bearing seed-ferns sequoia Seward shales shoots shown in figure similar southern species specimens sporangia sporangium spore sacs spores sporophylls stem structure stumps Tempskya Tertiary tissue tropical trunk Upper vegetation western wood woody Wyoming Yellowstone