The Geological History of PlantsK. Paul, Trench, 1888 - 290 pagini |
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Pagina 42
... diameter micro - millimetres . The outer face has tubes rar 27.6 mm . The average diameter in the lower surfa that in the outer to 13.8 . There is , however , no to the surface of the layers , though in some speci easily , with shining ...
... diameter micro - millimetres . The outer face has tubes rar 27.6 mm . The average diameter in the lower surfa that in the outer to 13.8 . There is , however , no to the surface of the layers , though in some speci easily , with shining ...
Pagina 50
... diameter , which under the microscope are found to be spore - cases ( or macrospores ) slightly papillate externally ( or more properly marked with dark pores ) , and sometimes show- ing a point of attachment on one side and a slit more ...
... diameter , which under the microscope are found to be spore - cases ( or macrospores ) slightly papillate externally ( or more properly marked with dark pores ) , and sometimes show- ing a point of attachment on one side and a slit more ...
Pagina 54
... diameter being from one seventy - fifth to one one hundredth of an inch , though they vary considerably in size . This , how- ever , I do not regard as an essential character . The edges , as seen in profile , are smooth , but the flat ...
... diameter being from one seventy - fifth to one one hundredth of an inch , though they vary considerably in size . This , how- ever , I do not regard as an essential character . The edges , as seen in profile , are smooth , but the flat ...
Pagina 55
... diameter of the disc in thickness . They never exhibit the triradiate marking seen in spores of Ly- copods , nor any definite point of attachment , though they sometimes show a minute elongated spot which may be of this nature , and ...
... diameter of the disc in thickness . They never exhibit the triradiate marking seen in spores of Ly- copods , nor any definite point of attachment , though they sometimes show a minute elongated spot which may be of this nature , and ...
Pagina 59
... diameter when ma- ture . The sporocarps of the microspores contain a vastly greater number of minute sporangia , about one two - hun- dredths of an inch in diameter . These contain disc - like antheridia , or microspores of very minute ...
... diameter when ma- ture . The sporocarps of the microspores contain a vastly greater number of minute sporangia , about one two - hun- dredths of an inch in diameter . These contain disc - like antheridia , or microspores of very minute ...
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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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