The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 20
... referred by him to the genus Sphenophyllum , † which is also allied to Rhizocarps . Still more remarkable is the discovery in the same beds of a stem with rhombic areoles or leaf - bases , to which the name Protostigma has been given ...
... referred by him to the genus Sphenophyllum , † which is also allied to Rhizocarps . Still more remarkable is the discovery in the same beds of a stem with rhombic areoles or leaf - bases , to which the name Protostigma has been given ...
Pagina 23
... referred to in a note to this chapter , have induced me to modify this view , and to hold that the tissues of these singular trees , which seem to have existed from the be- * " Palaeontologie des Thuringer Waldes , " 1856 . Figs . 2 , 3 ...
... referred to in a note to this chapter , have induced me to modify this view , and to hold that the tissues of these singular trees , which seem to have existed from the be- * " Palaeontologie des Thuringer Waldes , " 1856 . Figs . 2 , 3 ...
Pagina 24
... referred . They are trees of large size , with a coaly bark and large spreading roots , having the surface of the stem smooth or irregularly ribbed , but with a nodose or jointed appearance . Internally , they show a tissue of long ...
... referred . They are trees of large size , with a coaly bark and large spreading roots , having the surface of the stem smooth or irregularly ribbed , but with a nodose or jointed appearance . Internally , they show a tissue of long ...
Pagina 25
... referred to , and Claypole has described a tree from the Clinton group of the United States , with large ovate leaf - bases , to which he has given the name Glyptodendron . If the markings on these plants are really leaf - bases , they ...
... referred to , and Claypole has described a tree from the Clinton group of the United States , with large ovate leaf - bases , to which he has given the name Glyptodendron . If the markings on these plants are really leaf - bases , they ...
Pagina 26
... referred to the Algæ or sea- weeds , and indeed this group has been a sort of refuge for the destitute to which paleontologists have been accus- tomed to refer any anomalous or inexplicable form which , while probably organic , could ...
... referred to the Algæ or sea- weeds , and indeed this group has been a sort of refuge for the destitute to which paleontologists have been accus- tomed to refer any anomalous or inexplicable form which , while probably organic , could ...
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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