The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 20
... 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 . If a plant , this may * " Geological Magazine , " 1869 . See ...
... 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 . If a plant , this may * " Geological Magazine , " 1869 . See ...
Pagina 21
Sir John William Dawson. have been allied to the club - mosses . This seems to be all that we at present know of land - vegetation in the Siluro - Cambrian . So far as the remains go , they indicate the presence of the families of Rhizo ...
Sir John William Dawson. have been allied to the club - mosses . This seems to be all that we at present know of land - vegetation in the Siluro - Cambrian . So far as the remains go , they indicate the presence of the families of Rhizo ...
Pagina 23
... allied to those trees which Unger had described from the Erian of Thuringia , under the name Aporoxylon . * Later examples of more lax tissues from branches or young stems , and the elaborate examinations kindly undertaken for me by ...
... allied to those trees which Unger had described from the Erian of Thuringia , under the name Aporoxylon . * Later examples of more lax tissues from branches or young stems , and the elaborate examinations kindly undertaken for me by ...
Pagina 31
... allied to Nereites , and due either to worms or , as Nathorst has shown to be possible , to small crus- taceans . Many impressions of this kind occur in the Silurian beds of the Clinton series in Canada and New York , and are ...
... allied to Nereites , and due either to worms or , as Nathorst has shown to be possible , to small crus- taceans . Many impressions of this kind occur in the Silurian beds of the Clinton series in Canada and New York , and are ...
Pagina 33
... allied to Buthotrephis , or the ra- diating worm - burrows already re- ferred to ( Fig . 10 ) . Shrinkage - cracks are also abun- dant in some of the Carboniferous beds , and are sometimes accom- panied with impressions of rain- drops ...
... allied to Buthotrephis , or the ra- diating worm - burrows already re- ferred to ( Fig . 10 ) . Shrinkage - cracks are also abun- dant in some of the Carboniferous beds , and are sometimes accom- panied with impressions of rain- drops ...
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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