The Geological History of PlantsK. Paul, Trench, 1888 - 290 pagini |
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Pagina 70
... pith or cellular tissue , and the outer rind was strengthened with greatly thickened cells . But even this was not sufficient , and in the older stems wedge - shaped bundles of barred tissue were run out from the interior , forming an ...
... pith or cellular tissue , and the outer rind was strengthened with greatly thickened cells . But even this was not sufficient , and in the older stems wedge - shaped bundles of barred tissue were run out from the interior , forming an ...
Pagina 79
... pith and wood ; a , medullary sheath ; b , pith ; c , wood ; d , section of pith . в , Wood - cell ; a , hexagonal areole ; b , pore . c , Longitudinal section of wood , showing , a , areolation , and b , medullary rays . D , Transverse ...
... pith and wood ; a , medullary sheath ; b , pith ; c , wood ; d , section of pith . в , Wood - cell ; a , hexagonal areole ; b , pore . c , Longitudinal section of wood , showing , a , areolation , and b , medullary rays . D , Transverse ...
Pagina 80
... pith - cylinders , with curious transverse tubulæ , and which , when preserved separately , have been named Sternbergia . Allied to these trees , and perhaps intermediate between them and the Cycads , were those known as Cordaites ( Fig ...
... pith - cylinders , with curious transverse tubulæ , and which , when preserved separately , have been named Sternbergia . Allied to these trees , and perhaps intermediate between them and the Cycads , were those known as Cordaites ( Fig ...
Pagina 97
... pith surrounded with wood of coniferous type , showing two to three rows of slit - formed , bordered pores in hexagonal borders . The medullary sheath consists of pseudo - scalariform and reticulated fibres ; but the most remarkable ...
... pith surrounded with wood of coniferous type , showing two to three rows of slit - formed , bordered pores in hexagonal borders . The medullary sheath consists of pseudo - scalariform and reticulated fibres ; but the most remarkable ...
Pagina 122
... pith showing longitudinal striæ and constrictions at the nodes . Some- A C A 1 C2 00000000 200 B KA C1 B1 FIG . 45. - Asterophyllites , Sphenophyllum , and Annularia . A , Astero- phyllites trinerne . A1 , Leaf enlarged . B , Annularia ...
... pith showing longitudinal striæ and constrictions at the nodes . Some- A C A 1 C2 00000000 200 B KA C1 B1 FIG . 45. - Asterophyllites , Sphenophyllum , and Annularia . A , Astero- phyllites trinerne . A1 , Leaf enlarged . B , Annularia ...
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Termeni și expresii frecvente
Acrogens aërial roots Algæ allied America appear Archæopteris arctic areoles bark beds belong bituminous branches Brongniart bundles Calamites Canada Carboniferous Caulopteris cellular character clay climate coal coal-formation cones conifers Cordaites cycads cylinder Dadoxylon Dawson Demy 8vo deposits described Devonian dicotyledonous Eocene Erian Europe exogenous Fcap ferns flora formation forms fossil plants fronds fructification fruit Gaspé genera genus Geological Society Greenland Heer hemisphere Illustrations land Laramie leaf-bases leaf-scars leaves Lepidodendron Lepidophloios Lesquereux limestone Lower Carboniferous Lycopods macrospores medullary rays Mesozoic Middle Miocene modern northern Nova Scotia occur outer Palæozoic period Permian pines pinnules pith present probably Prof Psilophyton referred resemble Rhizocarps ribbed rocks sandstones scalariform Sequoia shales Sigillaria Silurian similar Small crown 8vo species specimens Sphenophyllum Sphenopteris Sporangites spore-cases spores sporocarps stems Sternbergia structure Tertiary thick tion tissue transverse tree-ferns trees trunks types Upper Cretaceous vascular scar vegetable wood woody
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