The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 15
... distinct organic tissues may be found in the Laurentian graphite , if formed from land - plants , more especially if any plants existed at that time having true woody or vascular tissues ; but it cannot with certainty be affirmed that ...
... distinct organic tissues may be found in the Laurentian graphite , if formed from land - plants , more especially if any plants existed at that time having true woody or vascular tissues ; but it cannot with certainty be affirmed that ...
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 ...
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Termeni și expresii frecvente
abundant Acrogens aërial roots Algæ allied America animal appear arctic areoles bark beds belong bituminous branches Brongniart Calamites Canada carbon Carboniferous Caulopteris cellular character clay climate coal coal-formation conifers Cordaites cycads Dadoxylon Dawson deposits described Devonian diameter dicotyledonous Eocene Europe exogenous fact ferns flora formation forms fossil fossil plants fronds fructification fruit Gaspé genera genus Geological Society graphite Greenland gymnospermous Heer hemisphere Journal known land land-plants Laramie Laurentian leaf-bases leaf-scars leaves Lepidodendron Lepidophloios Lesquereux limestone Lower Carboniferous Lycopods macrospores matter medullary rays Mesozoic Miocene modern Nematophyton northern Nova Scotia occur outer Palæozoic period Permian pines pinnules pith present preserved probably Prof Psilophyton referred remarkable resemble Rhizocarps rocks sandstones scalariform scars Sequoia shales Sigillaria Silurian similar species specimens Sphenophyllum Sporangites spore-cases spores sporocarps stems Sternbergia structure surface Tertiary thick tion tissue tree-ferns trees trunks types Upper Cretaceous vascular vegetable wood woody