The Geological History of PlantsK. Paul, Trench, 1888 - 290 pagini |
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Pagina 65
... scars . Young branch- es circinate ; rhizomata cylindrical , cov- ered with hairs or ramenta , and having circular areoles irregularly disposed , giv- ing origin to slender cylindrical rootlets . Internal structure - an axis of scalari ...
... scars . Young branch- es circinate ; rhizomata cylindrical , cov- ered with hairs or ramenta , and having circular areoles irregularly disposed , giv- ing origin to slender cylindrical rootlets . Internal structure - an axis of scalari ...
Pagina 71
... scars ( Leptophleum ) , and others with the leaf - scars in vertical rows ( Sigillaria ) , and others , again , with rounded leaf - scars , looking like the marks on Stigmaria , and belonging to the genus Cyclostigma . Thus some variety ...
... scars ( Leptophleum ) , and others with the leaf - scars in vertical rows ( Sigillaria ) , and others , again , with rounded leaf - scars , looking like the marks on Stigmaria , and belonging to the genus Cyclostigma . Thus some variety ...
Pagina 85
... scar of attachment better than those in balsam . Sections of the Kettle Point shale show , in addition to the ma- crospores , wider and thinner shreds of vegetable matter , which I am inclined to suppose to be remains of the sporocarps ...
... scar of attachment better than those in balsam . Sections of the Kettle Point shale show , in addition to the ma- crospores , wider and thinner shreds of vegetable matter , which I am inclined to suppose to be remains of the sporocarps ...
Pagina 87
... scars where they have fallen off . When in Belfast in 1870 , my attention was again directed to the affinities of these plants by finding in Prof. Thomson's collection a specimen from Caithness , which shows a plant apparently of this ...
... scars where they have fallen off . When in Belfast in 1870 , my attention was again directed to the affinities of these plants by finding in Prof. Thomson's collection a specimen from Caithness , which shows a plant apparently of this ...
Pagina 89
... scars , and the lower parts of the stems are often thus denuded of pinnæ for the length of one or more inches . ( 3 ) The stems curve in such a manner as to indicate a cir- cinate vernation . ( 4 ) In a few instances the fronds were ...
... scars , and the lower parts of the stems are often thus denuded of pinnæ for the length of one or more inches . ( 3 ) The stems curve in such a manner as to indicate a cir- cinate vernation . ( 4 ) In a few instances the fronds were ...
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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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