The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
Din interiorul cărții
Rezultatele 1 - 5 din 29
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 ...
Alte ediții - Afișează-le pe toate
Termeni și expresii frecvente
abundant Acrogens aërial roots Algæ allied America animal appear arctic areoles bark beds belong bituminous branches Brongniart Calamites Canada carbon Carboniferous Caulopteris cellular character clay climate coal coal-formation conifers Cordaites cycads Dadoxylon Dawson deposits described Devonian diameter dicotyledonous Eocene Europe exogenous fact ferns flora formation forms fossil fossil plants fronds fructification fruit Gaspé genera genus Geological Society graphite Greenland gymnospermous Heer hemisphere Journal known land land-plants Laramie Laurentian leaf-bases leaf-scars leaves Lepidodendron Lepidophloios Lesquereux limestone Lower Carboniferous Lycopods macrospores matter medullary rays Mesozoic Miocene modern Nematophyton northern Nova Scotia occur outer Palæozoic period Permian pines pinnules pith present preserved probably Prof Psilophyton referred remarkable resemble Rhizocarps rocks sandstones scalariform scars Sequoia shales Sigillaria Silurian similar species specimens Sphenophyllum Sporangites spore-cases spores sporocarps stems Sternbergia structure surface Tertiary thick tion tissue tree-ferns trees trunks types Upper Cretaceous vascular vegetable wood woody