The Geological History of PlantsK. Paul, Trench, 1888 - 290 pagini |
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Pagina 24
... 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 , cylin- drical tubes , traversed by a complex network of horizontal tubes thinner ...
... 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 , cylin- drical tubes , traversed by a complex network of horizontal tubes thinner ...
Pagina 25
... on " Erian Flora of Canada , " 1871 and 1882 , for full description of these fossils . " American Journal of Science , " 1878 . gard the supposed stigmaria - like roots as really stems LAURENTIAN AND EARLY PALEOZOIC . 25.
... on " Erian Flora of Canada , " 1871 and 1882 , for full description of these fossils . " American Journal of Science , " 1878 . gard the supposed stigmaria - like roots as really stems LAURENTIAN AND EARLY PALEOZOIC . 25.
Pagina 26
Sir John William Dawson. gard the supposed stigmaria - like roots as really stems , and the supposed rootlets as short , spine - like rudiment- ary leaves . All such comparisons must , however , in the mean time be regarded as ...
Sir John William Dawson. gard the supposed stigmaria - like roots as really stems , and the supposed rootlets as short , spine - like rudiment- ary leaves . All such comparisons must , however , in the mean time be regarded as ...
Pagina 33
... roots , fucoids 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 ...
... roots , fucoids 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 ...
Pagina 35
... roots of Stigmaria decayed within it . Most collectors of fossil plants in the older formations must , I presume , be familiar with appearances of this kind in connection with small stems , petioles , fragments of wood , and car ...
... roots of Stigmaria decayed within it . Most collectors of fossil plants in the older formations must , I presume , be familiar with appearances of this kind in connection with small stems , petioles , fragments of wood , and car ...
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Termeni și expresii frecvente
acrogens aërial roots Algæ allied America appear arctic areoles bark beds belong bituminous branches Brongniart bundles Calamites Canada Carboniferous Caulopteris cells cellular character climate coal coal-formation conifers Cordaites cycads cylinder Dadoxylon Dawson Demy 8vo described Devonian diameter Eocene Erian Europe exogenous Fcap ferns flora formation forms fossil plants fronds fructification fruit Gaspé genera genus Geological Society graphite Greenland hemisphere Illustrations Journal Laramie Laurentian leaf-bases leaf-scars leaves Lepidodendron Lepidophloios Lesquereux limestone Lower Carboniferous Lycopods macrospores medullary rays Mesozoic Middle modern Nova Scotia occur outer Paleozoic period Permian petioles pines pinnate pinnules pith present probably Prof Psilophyton referred resemble Rhizocarps ribbed rocks sandstones scalariform scars Second Edition Sequoia shales Sigillaria Silurian similar Small crown 8vo species specimens Sphenophyllum Sporangites spore-cases spores sporocarps stems Sternbergia structure Tertiary thick Third Edition tion tissue tree-ferns trees trunks Upper Cretaceous vascular vegetable vols Williamson wood woody
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