The Geological History of PlantsK. Paul, Trench, 1888 - 290 pagini |
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Pagina 4
... surface of the ground . Let us now tabulate the whole geologi with the history of animals and plants assoc ANIMALS . Age of Man and Mammalia . Age of Reptiles . Age of Amphibians and Fishes . Age of Inverte- brates . Palæozoic ...
... surface of the ground . Let us now tabulate the whole geologi with the history of animals and plants assoc ANIMALS . Age of Man and Mammalia . Age of Reptiles . Age of Amphibians and Fishes . Age of Inverte- brates . Palæozoic ...
Pagina 5
... surface of the earth , and their distribution to north and south must have beer determined mainly by the extent and direction of land though it may also have been modified by the changes in the astronomical relations and period of the ...
... surface of the earth , and their distribution to north and south must have beer determined mainly by the extent and direction of land though it may also have been modified by the changes in the astronomical relations and period of the ...
Pagina 24
... surface of the stem smooth or irregularly ribbed , but with a nodose or jointed appearance . Internally , they show a tissue of long , cylin- drical tubes , traversed by a complex network of horizontal tubes thinner walled and of ...
... surface of the stem smooth or irregularly ribbed , but with a nodose or jointed appearance . Internally , they show a tissue of long , cylin- drical tubes , traversed by a complex network of horizontal tubes thinner walled and of ...
Pagina 25
... surface - markings , though , as we have seen , it had bundles of tubes passing diagonally to the surface . These plants were more probably trees with an axis of barred vessels and thick , cellular bark , like the Lepidodendron of later ...
... surface - markings , though , as we have seen , it had bundles of tubes passing diagonally to the surface . These plants were more probably trees with an axis of barred vessels and thick , cellular bark , like the Lepidodendron of later ...
Pagina 27
... surface . Some- times , however , they may have been left by denudation of the surrounding material , just as footprints on dry snow remain in relief after the surrounding loose material has been drifted away by the wind ; the portion ...
... surface . Some- times , however , they may have been left by denudation of the surrounding material , just as footprints on dry snow remain in relief after the surrounding loose material has been drifted away by the wind ; the portion ...
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Termeni și expresii frecvente
acrogens aërial roots Algæ allied America appear arctic areoles bark beds belong bituminous branches Brongniart bundles Calamites Canada Carboniferous Caulopteris cells cellular character climate coal coal-formation conifers Cordaites cycads cylinder Dadoxylon Dawson Demy 8vo described Devonian diameter Eocene Erian Europe exogenous Fcap ferns flora formation forms fossil plants fronds fructification fruit Gaspé genera genus Geological Society graphite Greenland hemisphere Illustrations Journal Laramie Laurentian leaf-bases leaf-scars leaves Lepidodendron Lepidophloios Lesquereux limestone Lower Carboniferous Lycopods macrospores medullary rays Mesozoic Middle modern Nova Scotia occur outer Paleozoic period Permian petioles pines pinnate pinnules pith present probably Prof Psilophyton referred resemble Rhizocarps ribbed rocks sandstones scalariform scars Second Edition Sequoia shales Sigillaria Silurian similar Small crown 8vo species specimens Sphenophyllum Sporangites spore-cases spores sporocarps stems Sternbergia structure Tertiary thick Third Edition tion tissue tree-ferns trees trunks Upper Cretaceous vascular vegetable vols Williamson wood woody
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