The Geological History of Plants

Acrogens Algæ allied America animal appear arctic areoles bark beds belong bituminous branches Calamites Canada Carboniferous Caulopteris cellular character Cheaper Edition clay climate coal coal-formation conifers Cordaites cycads Dadoxylon Dawson Demy 8vo deposits described Devonian dicotyledonous Eocene Europe Fcap ferns flora formation forms fossil fossil plants Fourth Edition fronds Frontispiece fructification fruit Gaspé genera genus Geological Society graphite Greenland Heer hemisphere Illustrations land land-plants Laramie Large crown 8vo Laurentian leaf-bases leaf-scars leaves Lepidodendron Lepidophloios Lesquereux limestone Lower Carboniferous Lycopods macrospores medullary rays Mesozoic Middle Miocene modern Nova Scotia occur Palæozoic period pines pinnules pith present probably Prof Psilophyton referred resemble Rhizocarps 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 types Upper Cretaceous vascular vegetable vols wood woody