The Geological History of PlantsK. Paul, Trench, 1888 - 290 pagini |
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Pagina 34
... exogenous leaf . Flattened stems of plants and layers of cortical matter , when carbonised , shrink in such a manner as to produce minute reticulated cracks . These become filled with mineral matter before the coaly substance has been ...
... exogenous leaf . Flattened stems of plants and layers of cortical matter , when carbonised , shrink in such a manner as to produce minute reticulated cracks . These become filled with mineral matter before the coaly substance has been ...
Pagina 43
... exogenous , and the appearance of rings is independent of the causes which determine the layers of growth in exogenous plants . " 2. The plant was possessed of no true bark . Whatever cortical layer was present was in all probability a ...
... exogenous , and the appearance of rings is independent of the causes which determine the layers of growth in exogenous plants . " 2. The plant was possessed of no true bark . Whatever cortical layer was present was in all probability a ...
Pagina 70
... exogenous growth . The plan is , in short , the same with that of the stems of the exogenous trees of modern times , except that the tissues employed are less complicated . The structures of these remarkable * First noticed by the ...
... exogenous growth . The plan is , in short , the same with that of the stems of the exogenous trees of modern times , except that the tissues employed are less complicated . The structures of these remarkable * First noticed by the ...
Pagina 77
... exogenous stem , but doing duty for it ( Asteropteris ) . * Similar plants have been described from the Erian of Falken- berg , in Germany , and of Saalfeld , in Thuringia , by Goep- pert and Unger , and are referred to ferns by the ...
... exogenous stem , but doing duty for it ( Asteropteris ) . * Similar plants have been described from the Erian of Falken- berg , in Germany , and of Saalfeld , in Thuringia , by Goep- pert and Unger , and are referred to ferns by the ...
Pagina 96
... exogenous peculiarities , are really stems of tree - ferns , thus placing this family in the same position of advancement with the Lycopods and Equisetaceœ of the Coal period . IV . - ON ERIAN TREES OF THE GENUS DADOXYLon , Unger ...
... exogenous peculiarities , are really stems of tree - ferns , thus placing this family in the same position of advancement with the Lycopods and Equisetaceœ of the Coal period . IV . - ON ERIAN TREES OF THE GENUS DADOXYLon , Unger ...
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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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