The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina
... Tissues . 117 Coals and Erect Trees ( two Figures ) 118 , 119 Lepidodendron . 120 Lepidophloios . . 121 Asterophyllites , & c . . 122 Calamites ( five Figures ) . 123-125 Ferns of the Coal - formation ( six Figures ) 126-129 ...
... Tissues . 117 Coals and Erect Trees ( two Figures ) 118 , 119 Lepidodendron . 120 Lepidophloios . . 121 Asterophyllites , & c . . 122 Calamites ( five Figures ) . 123-125 Ferns of the Coal - formation ( six Figures ) 126-129 ...
Pagina 14
... tissue can sometimes be detected , and in some cases , as in the Lower Silurian limestone of the La Cloche Mount- ains in Canada , the pores of brachiopodous shells and the cells of corals have been penetrated by black bitu- minous ...
... tissue can sometimes be detected , and in some cases , as in the Lower Silurian limestone of the La Cloche Mount- ains in Canada , the pores of brachiopodous shells and the cells of corals have been penetrated by black bitu- minous ...
Pagina 15
... 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 such tissues ...
... 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 such tissues ...
Pagina 16
... 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 obscure traces of organic structure can be ...
... 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 obscure traces of organic structure can be ...
Pagina 17
... tissues . Under these circumstances the whole world must have resembled a damp , warm greenhouse , and plants loving such an at- mosphere could have grown luxuriantly . In these cir- cumstances the lower forms of aquatic vegetation and ...
... tissues . Under these circumstances the whole world must have resembled a damp , warm greenhouse , and plants loving such an at- mosphere could have grown luxuriantly . In these cir- cumstances the lower forms of aquatic vegetation and ...
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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