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 ... branches , and rudimentary leaves , and also the internal structure of the stems and rhizomata , and to ...
... scars . Young branch- es circinate ; rhizomata cylindrical , cov- ered with hairs or ramenta , and having circular ... branches , and rudimentary leaves , and also the internal structure of the stems and rhizomata , and to ...
Pagina 71
... 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 was given to the arbo- real club ...
... 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 was given to the arbo- real club ...
Pagina 87
... plants with verticillate leaves which are included in this genus . Before I had seen the publications of Hall and ... scars where they have fallen off . When in Belfast in 1870 , my attention was again directed to the affinities of ...
... plants with verticillate leaves which are included in this genus . Before I had seen the publications of Hall and ... scars where they have fallen off . When in Belfast in 1870 , my attention was again directed to the affinities of ...
Pagina 91
... plant found by Mr. Richardson at Perry , as possibly a species of Megaphyton , using that term to denote those stems of tree - ferns which have the leaf - scars in two vertical series ; but the specimen was obscure , and I have not yet ...
... plant found by Mr. Richardson at Perry , as possibly a species of Megaphyton , using that term to denote those stems of tree - ferns which have the leaf - scars in two vertical series ; but the specimen was obscure , and I have not yet ...
Pagina 92
... leaf- scars , each an inch in diameter , of a horseshoe - shape . The peti- oles , five of which remain , separate from these scars with a distinct articulation , except at one point near the base , where probably a bundle or bundles of ...
... leaf- scars , each an inch in diameter , of a horseshoe - shape . The peti- oles , five of which remain , separate from these scars with a distinct articulation , except at one point near the base , where probably a bundle or bundles of ...
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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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