The Geological History of PlantsK. Paul, Trench, 1888 - 290 pagini |
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Pagina 20
... Lesquereux has found some minute radiated leaves , referred by him to the genus Sphenophyllum , † which is also allied to Rhizocarps . Still more remarkable is the discovery in the same beds of a stem with rhombic areoles or leaf ...
... Lesquereux has found some minute radiated leaves , referred by him to the genus Sphenophyllum , † which is also allied to Rhizocarps . Still more remarkable is the discovery in the same beds of a stem with rhombic areoles or leaf ...
Pagina 25
... Lesquereux has already been referred to , and Claypole has described a tree from the Clinton group of the United States , with large ovate leaf - bases , to which he has given the name Glyptodendron . If the markings on these plants are ...
... Lesquereux has already been referred to , and Claypole has described a tree from the Clinton group of the United States , with large ovate leaf - bases , to which he has given the name Glyptodendron . If the markings on these plants are ...
Pagina 33
... Lesquereux seems to be an example of rill - mark , as well as Aristophy- cus , Clæphycus , and Zygophycus , of Miller and Dyer , from the Lower Silurian . Rill - marks occur in very old rocks , but are perhaps most beautifully preserved ...
... Lesquereux seems to be an example of rill - mark , as well as Aristophy- cus , Clæphycus , and Zygophycus , of Miller and Dyer , from the Lower Silurian . Rill - marks occur in very old rocks , but are perhaps most beautifully preserved ...
Pagina 46
... Lesquereux in Rogers's " Pennsylvania . " These might have added ten or twelve species to his list , some of them probably from the Lower Devonian . It is further to be observed that a few additional species had also been recognised by ...
... Lesquereux in Rogers's " Pennsylvania . " These might have added ten or twelve species to his list , some of them probably from the Lower Devonian . It is further to be observed that a few additional species had also been recognised by ...
Pagina 61
... Lesquereux from the upper part of the Siluro - Cambrian , * and a beautiful little spe- cies occurs in the Erian shales of St. John , New Bruns- wick . The genus is also continued , and is still more * " American Journal of Science ...
... Lesquereux from the upper part of the Siluro - Cambrian , * and a beautiful little spe- cies occurs in the Erian shales of St. John , New Bruns- wick . The genus is also continued , and is still more * " American Journal of Science ...
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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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