The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
Din interiorul cărții
Rezultatele 1 - 5 din 34
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
... " 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.
... " 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 ...
Alte ediții - Afișează-le pe toate
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