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Impressions From the Past
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Alethopteris angles Annularia apex attached bark bracts branch scars Brongniart Figs Bryophytes Calamites Calamostachys Caulopteris characteristic classified coal age Collected cones Cordaites Courtesy Illinois Cyclopteris Dactylotheca enter the base ferns forests fork once forms fossil plants fossils fronds furrows genera genus Goeppert Gymnospermous half inch Illinois State Geological Illinois State Museum impressions inch in length internodes keel lateral veinlets leaf cushions leaf scar leaves Lepidodendron Lepidophloios Lepidophyllum Lesquereux Fig Lindley linear lycopod lycopod trees margins Mariopteris Megaphyton midrib millimeters miltoni Artis Neuropteris nodes nules numerous obtusely occur paleobotany Pecopteris petrified petrified wood Photograph by author Photograph by George pinnae pinnules plant fossils preserved rachis Renaultia ribs rounded Schimper Schlotheim Schlotheim Fig seed-ferns seeds shale sharply pointed Sigillaria slightly sometimes species specimens Sphenophyllum Sphenopteris spore stem Sternberg Fig Stigmaria surface teeth tips tissue trunks types upper usually vary veinlets fork veins enter venation whorl widest width wrinkles