The Geological History of PlantsD. Appleton, 1888 - 290 pagini |
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Pagina 6
... spores instead of seeds ; and Phænogams , or those which possess flowers and pro- duce seeds containing an embryo of the future plant . The Cryptogams may be subdivided into the following three groups : 1. Thallogens , cellular plants ...
... spores instead of seeds ; and Phænogams , or those which possess flowers and pro- duce seeds containing an embryo of the future plant . The Cryptogams may be subdivided into the following three groups : 1. Thallogens , cellular plants ...
Pagina 25
... spores . They should perhaps constitute a separate class or order to which the name Nematodendreæ may be given , and of which Nematophyton will constitute one genus and Aporoxylon of Unger another . * Another question arises as to the ...
... spores . They should perhaps constitute a separate class or order to which the name Nematodendreæ may be given , and of which Nematophyton will constitute one genus and Aporoxylon of Unger another . * Another question arises as to the ...
Pagina 40
... , carbonaceous débris. FIG . 14. - Silurian vegetation restored . Protannularia , Berwynia , Nema- tophyton , Sphenophyllum , Arthrostigma , Psilophyton . raised as to the share of spores and spore -. 40 THE GEOLOGICAL HISTORY OF PLANTS .
... , carbonaceous débris. FIG . 14. - Silurian vegetation restored . Protannularia , Berwynia , Nema- tophyton , Sphenophyllum , Arthrostigma , Psilophyton . raised as to the share of spores and spore -. 40 THE GEOLOGICAL HISTORY OF PLANTS .
Pagina 41
... spores and seeds and even fruits , these were probably all of the types seen in the modern acrogens and gymnosperms . " In garments green , indistinct in the twilight , They stand like Druids of old , with voices sad and prophetic ...
... spores and seeds and even fruits , these were probably all of the types seen in the modern acrogens and gymnosperms . " In garments green , indistinct in the twilight , They stand like Druids of old , with voices sad and prophetic ...
Pagina 49
... again reviewed. raised as to the share of spores and spore - cases in the ac- cumulation of coal , a question to be discussed in a sub- FIG . 20. Sphe- nophyllum an- tiquum ( Erian ,. THE ERIAN OR DEVONIAN FORESTS . 49.
... again reviewed. raised as to the share of spores and spore - cases in the ac- cumulation of coal , a question to be discussed in a sub- FIG . 20. Sphe- nophyllum an- tiquum ( Erian ,. THE ERIAN OR DEVONIAN FORESTS . 49.
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abundant Acrogens 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 Heer hemisphere Illustrations 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 Upper Erian vascular vegetable wood woody