The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 15
... character of the Hu- ronian . I There is thus no absolute impossibility 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 ...
... character of the Hu- ronian . I There is thus no absolute impossibility 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 ...
Pagina 20
... character that they are really plants , I am inclined to re- fer them not to Algæ , but probably to Rhizocarps . They consist of slender branching stems , with whorls of elongate and pointed leaves , resembling the genus Annularia of ...
... character that they are really plants , I am inclined to re- fer them not to Algæ , but probably to Rhizocarps . They consist of slender branching stems , with whorls of elongate and pointed leaves , resembling the genus Annularia of ...
Pagina 24
... character is shown by its state of preser- vation ; and the structure of the seeds called Pachytheca , with their constant association with these trees , give coun- tenance to the belief that they are the fruit of Nema- tophyton . Of ...
... character is shown by its state of preser- vation ; and the structure of the seeds called Pachytheca , with their constant association with these trees , give coun- tenance to the belief that they are the fruit of Nema- tophyton . Of ...
Pagina 28
... character of those named FIG . 6. - Trail of Carboniferous crustacean ( Rusichnites Acadicus ) , Nova Scotia , to illustrate supposed Algæ . Climactichnites , from the same beds which afford Pro- tichnites. * " Canadian Naturalist ...
... character of those named FIG . 6. - Trail of Carboniferous crustacean ( Rusichnites Acadicus ) , Nova Scotia , to illustrate supposed Algæ . Climactichnites , from the same beds which afford Pro- tichnites. * " Canadian Naturalist ...
Pagina 36
... character . It may be described as follows : Buthotrephis Grantii , S. N. ( Fig . 13 ) .- Stems and * Appendix , p . 676 , edition of 1878 . fronds smooth and slightly striate longitudinally , with curved and. 36 THE GEOLOGICAL HISTORY ...
... character . It may be described as follows : Buthotrephis Grantii , S. N. ( Fig . 13 ) .- Stems and * Appendix , p . 676 , edition of 1878 . fronds smooth and slightly striate longitudinally , with curved and. 36 THE GEOLOGICAL HISTORY ...
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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