The Geological History of PlantsK. Paul, Trench, 1888 - 290 pagini |
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Pagina 16
... distinct preservation of their forms or tissues , or of our being able to distinguish the remains of land - plants from those of Algæ . We may sum up these facts and considerations in the following statements : First , that somewhat ...
... distinct preservation of their forms or tissues , or of our being able to distinguish the remains of land - plants from those of Algæ . We may sum up these facts and considerations in the following statements : First , that somewhat ...
Pagina 24
... distinct from any form of vegetation hitherto known , and are possibly survivors of that prototypal flora to which I have already referred . They are trees of large size , with a coaly bark and large spreading roots , having the surface ...
... distinct from any form of vegetation hitherto known , and are possibly survivors of that prototypal flora to which I have already referred . They are trees of large size , with a coaly bark and large spreading roots , having the surface ...
Pagina 38
... distinct carbonaceous films , and others from the Quebec group , which seem to be cylindrical tubes now flattened , and which have con- tained spindle - shaped sporangia of large size . Tortuous and curved flattened stems , or fronds ...
... distinct carbonaceous films , and others from the Quebec group , which seem to be cylindrical tubes now flattened , and which have con- tained spindle - shaped sporangia of large size . Tortuous and curved flattened stems , or fronds ...
Pagina 44
... distinct lines of flow , that it must have been in a plastic state at a former period . The only evidence of structure was found in certain well - defined mycelia , which may have been derived from associated vegetable matter upon which ...
... distinct lines of flow , that it must have been in a plastic state at a former period . The only evidence of structure was found in certain well - defined mycelia , which may have been derived from associated vegetable matter upon which ...
Pagina 52
... distinct species . I may add that in the " Geological Magazine " for 1875 , Mr. Newton , F. G. S. , of the Geological Survey of " Cotteswold Naturalists ' Field Club , " 1884 ; " Journal of the Royal Microscopical Society , " 1885 ...
... distinct species . I may add that in the " Geological Magazine " for 1875 , Mr. Newton , F. G. S. , of the Geological Survey of " Cotteswold Naturalists ' Field Club , " 1884 ; " Journal of the Royal Microscopical Society , " 1885 ...
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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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