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Proﬁles in History Scope and Objectives of Paleobotany 710
Ground thin sections Film or Peel technique Transfer technique
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adaxial aﬂinities algae angiosperms apex appendages arborescent attached axis bears bracts branches bundles Carboniferous cells coal comprise cone conifers cortex Cretaceous cupule cycads deposits described Devonian diameter dichotomously evolution EVOLUTIONARY CORRELATIONS fern-like ferns fertile ﬂattened ﬂora ﬂowers forms fossil fossil record fronds fructiﬁcations genera genus geologic Glossopteris Gondwana gymnosperms herbaceous India integument Jurassic known large number layer leaf bases leaf trace leaves lobed Lower Carboniferous lycopsids marked megaspore Mesozoic microspores midrib modiﬁed nodes nucellus occur organs origin ovules Paleobotany Paleozoic parenchyma Permian petiole petrifactions petriﬁed pinnae pinnules pith plants pollen present preserved primary xylem protostelic protoxylem Pteridosperms rachis Rajmahal Hills Redrawn represented resembles Rhynia rocks Sahni secondary veins secondary xylem seed shows signiﬁcance similar species specimens sphenopsids spirally sporangia sporangiophores sporangium spores sporocarp sporophylls stele stem sterile stomata strand structure surface synangia Tertiary thick tion tissues tracheids Triassic upto vascular venation whorls