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In the Beginning
Early Plant Lifethe Thallophytes
5 other sections not shown
acid Aneurophyton angiosperms animals appeared appendages arborescent Archaeopteris areas Asteroxylon atmosphere axis bacteria Barghoorn bearing billion years ago blue-green algae bore bract Cambrian carbon Carboniferous cells chert club mosses conifers Cooksonia Cordaites Cretaceous dehiscence deposits dichotomously dwarf shoot Early Devonian Earth Emsian Eocene evidence evolution evolutionary evolved extinct female cone Figure filaments flattened flora forms fossil genera genus geologic green algae groups gymnosperms heterospory horsetails hypothesis land plants land surface Late Devonian lateral branch systems leaf leaves living lycopods megasporangium megaspore Middle Devonian million modern Oregon organisms origin ovuliferous scale oxygen Paleozoic Period Permian pine Pliocene Precambrian present preserved primary xylem produced Psilophyton Rhynia Rhynia-type rock secondary fertile branches sediments seed ferns showing Siegenian Silurian species specimens sporangia sporangium spores sporophyll stem strata stromatolites structure subtending terminal Tetraxylopteris tion tissue tracheids Transverse section trees Upper vascular plants whorled xylem strand Zosterophyllum Zosterophyllum-type