Contents 1 Overview of the paleobotanical record 2 Plant fossils 2.1 Preservation of plant fossils 2.2 Fossil-taxa 3 Fossil groups of plants 4 Notable paleobotanists 5 See also 6 References 6.1 Further reading 7 External links


Overview of the paleobotanical record[edit] Macroscopic remains of true vascular plants are first found in the fossil record during the Silurian Period of the Paleozoic era. Some dispersed, fragmentary fossils of disputed affinity, primarily spores and cuticles, have been found in rocks from the Ordovician Period in Oman, and are thought to derive from liverwort- or moss-grade fossil plants (Wellman, Osterloff & Mohiuddin 2003). An unpolished hand sample of the Lower Devonian Rhynie Chert from Scotland An important early land plant fossil locality is the Rhynie Chert, found outside the village of Rhynie in Scotland. The Rhynie chert is an Early Devonian sinter (hot spring) deposit composed primarily of silica. It is exceptional due to its preservation of several different clades of plants, from mosses and lycopods to more unusual, problematic forms. Many fossil animals, including arthropods and arachnids, are also found in the Rhynie Chert, and it offers a unique window on the history of early terrestrial life. Plant-derived macrofossils become abundant in the Late Devonian and include tree trunks, fronds, and roots. The earliest tree was thought to be Archaeopteris, which bears simple, fern-like leaves spirally arranged on branches atop a conifer-like trunk (Meyer-Berthaud, Scheckler & Wendt 1999), though it is now known to be the recently discovered Wattieza.[3] Widespread coal swamp deposits across North America and Europe during the Carboniferous Period contain a wealth of fossils containing arborescent lycopods up to 30 meters tall, abundant seed plants, such as conifers and seed ferns, and countless smaller, herbaceous plants. Angiosperms (flowering plants) evolved during the Mesozoic, and flowering plant pollen and leaves first appear during the Early Cretaceous, approximately 130 million years ago.


Plant fossils[edit] A plant fossil is any preserved part of a plant that has long since died. Such fossils may be prehistoric impressions that are many millions of years old, or bits of charcoal that are only a few hundred years old. Prehistoric plants are various groups of plants that lived before recorded history (before about 3500 BC). Preservation of plant fossils[edit] Ginkgoites huttonii, Middle Jurassic, Yorkshire, UK. Leaves preserved as compressions. Specimen in Munich Palaeontological Museum, Germany. Plant fossils can be preserved in a variety of ways, each of which can give different types of information about the original parent plant. These modes of preservation are discussed in the general pages on fossils but may be summarised in a palaeobotanical context as follows. Adpressions (compressions - impressions). These are the most commonly found type of plant fossil. They provide good morphological detail, especially of dorsiventral (flattened) plant parts such as leaves. If the cuticle is preserved, they can also yield fine anatomical detail of the epidermis. Little other detail of cellular anatomy is normally preserved. Rhynia, Lower Devonian Rhynie Chert, Scotland, UK. Transverse section through a stem preserved as a silica petrifaction, showing preservation of cellular structure. Petrifactions (permineralisations or anatomically preserved fossils). These provide fine detail of the cell anatomy of the plant tissue. Morphological detail can also be determined by serial sectioning, but this is both time consuming and difficult. Moulds and casts. These only tend to preserve the more robust plant parts such as seeds or woody stems. They can provide information about the three-dimensional form of the plant, and in the case of casts of tree stumps can provide evidence of the density of the original vegetation. However, they rarely preserve any fine morphological detail or cell anatomy. A subset of such fossils are pith casts, where the centre of a stem is either hollow or has delicate pith. After death, sediment enters and forms a cast of the central cavity of the stem. The best known examples of pith casts are in the Carboniferous Sphenophyta (Calamites) and cordaites (Artisia). Crossotheca hughesiana Kidston, Middle Pennsylvanian, Coseley, near Dudley, UK. A lyginopteridalean pollen organ preserved as an authigenic mineralization (mineralized in situ). Specimen in Sedgwick Museum, Cambridge, UK. Authigenic mineralisations. These can provide very fine, three-dimensional morphological detail, and have proved especially important in the study of reproductive structures that can be severely distorted in adpressions. However, as they are formed in mineral nodules, such fossils can rarely be of large size. Fusain. Fire normally destroys plant tissue but sometimes charcoalified remains can preserve fine morphological detail that is lost in other modes of preservation; some of the best evidence of early flowers has been preserved in fusain. Fusain fossils are delicate and often small, but because of their buoyancy can often drift for long distances and can thus provide evidence of vegetation away from areas of sedimentation. Fossil-taxa[edit] Plant fossils almost always represent disarticulated parts of plants; even small herbaceous plants are rarely preserved whole. Those few examples of plant fossils that appear to be the remains of whole plants in fact are incomplete as the internal cellular tissue and fine micromorphological detail is normally lost during fossilisation. Plant remains can be preserved in a variety of ways, each revealing different features of the original parent plant. Because of these difficulties, palaeobotanists usually assign different taxonomic names to different parts of the plant in different modes of preservation. For instance, in the subarborescent Palaeozoic sphenophytes, an impression of a leaf might be assigned to the genus Annularia, a compression of a cone assigned to Palaeostachya, and the stem assigned to either Calamites or Arthroxylon depending on whether it is preserved as a cast or a petrifaction. All of these fossils may have originated from the same parent plant but they are each given their own taxonomic name. This approach to naming plant fossils originated with the work of Alexandre Brongniart[4] and has stood the test of time. For many years this approach to naming plant fossils was accepted by palaeobotanists but not formalised within the International Rules of Botanical Nomenclature.[5] Eventually, Thomas (1935) and Jongmans, Halle & Gothan (1935) proposed a set of formal provisions, the essence of which was introduced into the 1952 International Code of Botanical Nomenclature.[6] These early provisions allowed fossils representing particular parts of plants in a particular state of preservation to be referred to organ-genera. In addition, a small subset of organ-genera, to be known as form-genera, were recognised based on the artificial taxa introduced by Brongniart (1822) mainly for foliage fossils. Over the years, the concepts and regulations surrounding organ- and form-genera became modified within successive codes of nomenclature, reflecting a failure of the palaeobotanical community to agree on how this aspect of plant taxonomic nomenclature should work (a history reviewed by Cleal & Thomas (2010)). The use of organ- and fossil-genera was abandoned with the St Louis Code (Greuter et al. 2000), replaced by "morphotaxa". The situation in the Vienna Code of 2005[7] was that any plant taxon whose type is a fossil, except Diatoms, can be described as a morphotaxon, a particular part of a plant preserved in a particular way. Although the name is always fixed to the type specimen, the circumscription (i.e. range of specimens that may be included within the taxon) is defined by the taxonomist who uses the name. Such a change in circumscription could result in an expansion of the range of plant parts and/or preservation states that can be incorporated within the taxon. For instance, a fossil-genus originally based on compressions of ovules could be used to include the multi-ovulate cupules within which the ovules were originally borne. A complication can arise if, in this case, there was an already named fossil-genus for these cupules. If palaeobotanists were confident that the type of the ovule fossil-genus and of the cupule fossil-genus could be included in the same genus, then the two names would compete as to being the correct one for the newly emended genus. Morphotaxa were introduced to try to overcome the issue of competing names that represented different plant parts and/or preservation states. What would you do if the species-name of a pollen-organ was pre-dated by the species name of the type of pollen produced by that pollen organ. It was argued that palaeobotanists would be unhappy if the pollen organs were named using the taxonomic name whose type specimen is a pollen grain. As pointed out by Cleal & Thomas (2010), however, the risk of the name of a pollen grain supplanting the name of a pollen organ is most unlikely. Palaeobotanists would have to be totally confident that the type specimen of the pollen species, which would normally be a dispersed grain, definitely came from the same plant that produced the pollen organ. We know from modern plants that closely related but distinct species can produce virtually indistinguishable pollen. It would seem that morphotaxa offer no real advantage to palaeobotanists over normal fossil-taxa and the concept was abandoned with the 2011 botanical congress and the 2012 International Code of Nomenclature for algae, fungi, and plants.


Fossil groups of plants[edit] Stigmaria, a common fossil tree root. Upper Carboniferous of northeastern Ohio. External mold of Lepidodendron from the Upper Carboniferous of Ohio. Main articles: Evolutionary history of plants and List of extinct plants Some plants have remained remarkedly unchanged throughout earth's geological time scale. Early ferns had developed by the Mississippian, conifers by the Pennsylvanian. Some plants of prehistory are the same ones around today and are thus living fossils, such as Ginkgo biloba and Sciadopitys verticillata. Other plants have changed radically, or have gone extinct entirely. Examples of prehistoric plants are: Araucaria mirabilis Archaeopteris Calamites Dillhoffia Glossopteris Hymenaea protera Nelumbo aureavallis Pachypteris Palaeoraphe Peltandra primaeva Protosalvinia Trochodendron nastae


Notable paleobotanists[edit] This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. (April 2016) (Learn how and when to remove this template message) Edward W. Berry (1875–1945), paleoecology and phytogeography William Gilbert Chaloner (1928-) Isabel Cookson (1893-1973), early vascular plants, palynology Dianne Edwards (1942-), colonisation of land by early terrestrial floras Thomas Maxwell Harris (1903–1983), Mesozoic plants of Jameson Land (Greenland) and Yorkshire. Robert Kidston (1852-1924), early land plants, Devonian and Carboniferous floras, and their use in stratigraphy Birbal Sahni (1891–1949), Revision of Indian Gondwana Plants Dunkinfield Henry Scott (1854–1934), analysis of the structures of fossil plants Constantin von Ettingshausen (1826–1897), Tertiary floras Kaspar Maria von Sternberg (1761–1838), the "father of paleobotany" Franz Unger (1800–1870), pioneer in plant physiology, phytotomy and soil science Jack A. Wolfe (1936–2005), Tertiary paleoclimate of western North America Gilbert Arthur Leisman (1924–1996), known for work on Carboniferous lycophytes of central North America.


See also[edit] Paleontology portal Cryptospores Evolutionary history of plants Prehistoric life Timeline of plant evolution


References[edit] ^ "Brongniart, Adolphe-Théodore". www.encyclopedia.com. Encyclopedia.com: FREE online dictionary. Retrieved 22 February 2017.  ^ Cleal, Christopher J.; Lazarus, Maureen; Townsend, Annette (2005). "Illustrations and illustrators during the 'Golden Age' of palaeobotany: 1800–1840". In Bowden, A. J.; Burek, C. V.; Wilding, R. History of palaeobotany : selected essays. London: Geological Society of London. p. 41. ISBN 9781862391741.  ^ Speer, Brian R. (10 June 1995), The Devonian Period, retrieved 12 May 2012  ^ Brongniart (1822) ^ Briquet, J. (1906), Règles internationales de la nomenclature botanique adoptées par le Congrès International de Botanique de Vienne 1905, Jena: Fischer, OCLC 153969885  ^ Lanjouw et al. 1952 ^ McNeill 2006 Further reading[edit] Brongniart, A. (1822), "Sur la classification et la distribution des végétaux fossiles en général, et sur ceux des terrains de sediment supérieur en particulier", Mém. Mus. Natl. Hist. Nat., 8: 203–240, 297–348.  Cleal, C.J. & Thomas, B.A. (2010), "Botanical nomenclature and plant fossils", Taxon, 59: 261–268  Greuter, W.; McNeill, J.; Barrie, F R.; Burdet, H.M.; Demoulin, V.; Filgueiras, T.S.; Nicolson, D.H.; Silva, P.C.; Skog, J.E.; Turland, N.J. & Hawksworth, D.L. (2000), International Code of Botanical Nomenclature (Saint Louis Code), Königstein.: Koeltz Scientific Books, ISBN 978-3-904144-22-3  Jongmans, W.J.; Halle, T.G. & Gothan, W. (1935), Proposed additions to the International Rules of Botanical Nomenclature adopted by the fifth International Botanical Congress Cambridge1930, Heerlen, OCLC 700752855  Lanjouw, J.; Baehni, C.; Merrill, E.D.; Rickett, H.W.; Robyns, W.; Sprague, T.A. & Stafleu, F.A. (1952), International Code of Botanical Nomenclature: Adopted by the Seventh International Botanical Congress; Stockholm, July 1950, Regnum Vegetabile 3, Utrecht: International Bureau for Plant Taxonomy of the International Association for Plant Taxonomy, OCLC 220069027  McNeill, J.; et al., eds. (2006), International code of botanical nomenclature (Vienna Code) adopted by the seventeenth International Botanical Congress, Vienna, Austria, July 2005 (electronic ed.), Vienna: International Association for Plant Taxonomy, archived from the original on 6 October 2012, retrieved 2011-02-20  Meyer-Berthaud, Brigitte; Scheckler, S.E. & Wendt, J. (1999), "Archaeopteris is the Earliest Modern Tree", Nature, 398 (6729): 700–701, Bibcode:1999Natur.398..700M, doi:10.1038/19516  Thomas, H.H. (1935), "Proposed additions to the International Rules of Botanical Nomenclature suggested by British palæobotanists" (PDF), Journal of Botany, 73: 111  Wellman, Charles H.; Osterloff, Peter L. & Mohiuddin, Uzma (2003), "Fragments of the Earliest Land Plants", Nature, 425 (6955): 282–285, Bibcode:2003Natur.425..282W, doi:10.1038/nature01884, PMID 13679913  Wilson N. Stewart and Gar W. Rothwell. 2010. Paleobotany and the Evolution of Plants, Second edition. Cambridge University Press, Cambridge, UK. ISBN 978-0-521-38294-6. Thomas N. Taylor, Edith L. Taylor, and Michael Krings. 2008. Paleobotany: The Biology and Evolution of Fossil Plants, 2nd edition. Academic Press (an imprint of Elsevier): Burlington, MA; New York, NY; San Diego, CA, USA, London, UK. 1252 pages. ISBN 978-0-12-373972-8.


External links[edit] Wikisource has the text of the 1911 Encyclopædia Britannica article Palaeobotany. International Organisation of Paleobotany Botanical Society of America - Paleobotanical Section Paleobotany Research Group, University Münster, Germany. The Biota of Early Terrestrial Ecosystems: The Rhynie Chert, University of Aberdeen, UK. Bibliography of Paleobotany The Sternberg Project PaleoNet - listservs and links related to paleontology Jurassic Park plants Plants that lived when dinosaurs roamed the earth. Global registry of scientific names of fossil organisms. v t e Botany History of botany Subdisciplines Plant systematics Ethnobotany Paleobotany Plant anatomy Plant ecology Phytogeography Geobotany Flora Phytochemistry Plant pathology Bryology Phycology Floristics Dendrology Plant groups Algae Archaeplastida Bryophyte Non-vascular plants Vascular plants Spermatophytes Pteridophyte Gymnosperm Angiosperm Plant morphology (glossary) Plant cells Cell wall Phragmoplast Plastid Plasmodesma Vacuole Tissues Meristem Vascular tissue Vascular bundle Ground tissue Mesophyll Cork Wood Storage organs Vegetative Root Rhizoid Bulb Rhizome Shoot Stem Leaf Petiole Cataphyll Bud Sessility Reproductive (Flower) Flower development Inflorescence Umbel Raceme Bract Pedicellate Flower Whorl Floral symmetry Floral diagram Floral formula Receptacle Hypanthium (Floral cup) Perianth Tepal Petal Sepal Sporophyll Gynoecium Ovary Ovule Stigma Archegonium Androecium Stamen Staminode Pollen Tapetum Gynandrium Gametophyte Sporophyte Plant embryo Fruit Fruit anatomy Berry Capsule Seed Seed dispersal Endosperm Surface structures Epicuticular wax Plant cuticle Epidermis Stoma Nectary Trichome Prickle Plant physiology Materials Nutrition Photosynthesis Chlorophyll Plant hormone Transpiration Turgor pressure Bulk flow Aleurone Phytomelanin Sugar Sap Starch Cellulose Plant growth and habit Secondary growth Woody plants Herbaceous plants Habit Vines Lianas Shrubs Subshrubs Trees Succulent plants Reproduction Evolution Ecology Alternation of generations Sporangium Spore Microsporangia Microspore Megasporangium Megaspore Pollination Pollinators Pollen tube Double fertilization Germination Evolutionary development Evolutionary history timeline Hardiness zone Plant taxonomy History of plant systematics Herbarium Biological classification Botanical nomenclature Botanical name Correct name Author citation International Code of Nomenclature for algae, fungi, and plants (ICN) - for Cultivated Plants (ICNCP) Taxonomic rank International Association for Plant Taxonomy (IAPT) Plant taxonomy systems Cultivated plant taxonomy Citrus taxonomy cultigen cultivar Group grex Practice Agronomy Floriculture Forestry Horticulture Lists Related topics Botanical terms Botanists by author abbreviation Botanical expedition Category Portal WikiProject Authority control GND: 4044361-9 NDL: 00566701 Retrieved from "https://en.wikipedia.org/w/index.php?title=Paleobotany&oldid=813645395" Categories: PaleobotanySubfields of paleontologyBranches of botanyHidden categories: Articles needing additional references from October 2011All articles needing additional referencesArticles needing additional references from April 2016Wikipedia articles with GND identifiers


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