The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 29
... genera are really Algae related to Caulerpa , or even branches of Conifers of the genus Brachyphyllum . Nereites and Planulites are tracks and burrows of worms , with or without marks of setæ , and some of the * The name Bilobites was ...
... genera are really Algae related to Caulerpa , or even branches of Conifers of the genus Brachyphyllum . Nereites and Planulites are tracks and burrows of worms , with or without marks of setæ , and some of the * The name Bilobites was ...
Pagina 37
... genera . All of these plants have either car- bonaceous matter or produce organ- ic stains on the matrix . The organism with diverging FIG . 13. - Buthotrephis Grantii , a genuine Alga from the Silurian , Canada . wedge - shaped fronds ...
... genera . All of these plants have either car- bonaceous matter or produce organ- ic stains on the matrix . The organism with diverging FIG . 13. - Buthotrephis Grantii , a genuine Alga from the Silurian , Canada . wedge - shaped fronds ...
Pagina 45
... which all but seven are terrestrial plants , representing * Jena , 1860 . a large number of the genera occurring in the succeeding 6 CHAPTER III THE ERIAN OR DEVONIAN FORESTS-ORIGIN OF PETROLEUM-THE AGE OF ACROGENS AND GYMNOSPERMS •
... which all but seven are terrestrial plants , representing * Jena , 1860 . a large number of the genera occurring in the succeeding 6 CHAPTER III THE ERIAN OR DEVONIAN FORESTS-ORIGIN OF PETROLEUM-THE AGE OF ACROGENS AND GYMNOSPERMS •
Pagina 46
... genera , and including all the great types of vascular Cryptogams , the Gymnosperms , and even one ( still doubtful ) Angiosperm . Many new forms have also been described from the De- vonian of Scotland and of the Continent of Europe ...
... genera , and including all the great types of vascular Cryptogams , the Gymnosperms , and even one ( still doubtful ) Angiosperm . Many new forms have also been described from the De- vonian of Scotland and of the Continent of Europe ...
Pagina 67
... genera must have been nearly related , and the slender branchlets of Arthrostigma are , unless well pre- served , scarcely distinguishable from the stems of Psilo- phyton . * If , now , we compare the vegetation of these and simi- lar ...
... genera must have been nearly related , and the slender branchlets of Arthrostigma are , unless well pre- served , scarcely distinguishable from the stems of Psilo- phyton . * If , now , we compare the vegetation of these and simi- lar ...
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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