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THE FERNS AND THEIR ANCESTORS
LINGERING REMNANTS OF THE COAL AGE
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abundance algae ancestors ancient appearance bearing borne botanical botanists branches Carboniferous cells chapter climate clubmosses Coal Age coal balls coal seams cones conifers conspicuous courtesy Cretaceous cycads deposits Devonian distinctive early earth eastern Eocene evidence evolution feet ferns flowering plants foliage fossil flora fossil forests fossil plants fossil record frond gametophyte Garden genus ginkgo Greenland group of plants horsetail inch Jurassic known later 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 sporophyll stem structure stumps Tempskya Tertiary tissue trees tropical trunk Upper vegetation western wood woody Wyoming Yellowstone