Porostrobus nathorstii (Leary & Mickle) emend. and its spores from the Namurian of Illinois, USA


Authors: Bek J, Leary RL

Published in: Bulletin of Geosciences, volume 87, issue 1; pages: 45 - 52; Received 27 June 2011; Accepted in revised form 9 November 2011; Online 25 January 2012

Keywords: herbaceous lycopsids, in situ spores, Porostrobus, Bothrodendrostrobus, Carboniferous,

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The type collection of the Carboniferous selaginellalean lycopsid cone species Porostrobus nathorstii (Leary & Mickle) emend. was palynologically re-examined for in situ microspores. Originally (Leary & Mickle 1989) this species was proposed as monosporangiate with only megaspores, but now microsporangia yielded microspores compared to the dispersed miospore genus Cingulizonates (Dybova & Jachowicz) Butterworth et al. All species of the genus Porostrobus Nathorst are, therefore, bisporangiate with in situ megaspores of the Setosisporites-type and microspores belong to the densospore group [genera Densosporites (Berry) Butterworth et al. and Cingulizonates]. The history of Porostrobus and Bothrodendrostrobus Hirmer cones is discussed with aspect of their possible relationship and ecological needs.


Balme, B.A. 1995. Fossil in situ spores and pollen grains: an annotated catalogue. Review of Palaeobotany and Palynology 87, 81- 323. View article

Bartram, K.M. 1987. Lycopod succession in coals: an example from the Low Burnley Seam (Westphalian B), Yorkshire, England, 187-199. In Scott, A.C. (ed.) Coal and Coal-bearing strata: Recent advances. Geological Society, Special Publications 32.

Bek, J., Opluštil, S. & DrÁbkovÁ, J. 2001. Two species of Selaginella cones and their spores from the Bohemian Carboniferous continental basis of the Czech Republic. Review of Palaeobotany and Palynology 114, 57-81. View article

Bharadwaj, D.A. 1958. On Porostrobus zeilleri Nathorst and its spores with remarks on the systematic position of P. benholdi Bode and phylogeny of Densosporites Berry. The Palaeobotanist 7, 67-75.

Butterworth, M.A. 1964. Die vertliegung der Densosporites sphaerotriangularis in Westphalian B der westpenninschen steinkohlenfelder Englands. Fortschritte in der Geologie von Rheinland und Westphalen 12, 3173-330.

Chaloner, W.G. 1958. A Carboniferous Selaginellites with Densosporites microspores. Palaeontology 1, 245-253.

Chaloner, W.G. 1962. A Sporangiostrobus with Densosporites microspores. Palaeontology 5, 73-85.

Chaloner, W.G. 1967. Lycophyta, 437-802. In Boureau, E. (ed.) Traité de Paléobotanique. Tome II. Masson et Cie, Paris.

Dettmann, M.E. 1963. Upper Mesozoic microfloras from southeastern Australia. Proceedings of the Royal Society of Victoria 77, 1-148.

Eble, C.F. & Grady, W.C. 1990. Paleoecological interpretation of a Middle Pennsylvanian coal bed from the central Appalachian Basin, U.S.A. International Journal of Coal Geology 16, 255-286. View article

Habib, B. & Groth, P.K.H. 1967. Paleoecology of migrating Carboniferous peat habitats. Palaeogeography, Palaeoclimatology, Palaeoecology 3, 185-195. View article

Havlena,V. 1970. Ecology and mode of deposition of the macroflora in cyclothems of the Ostrava Formation (Namurian A). Věstník Ústředního ústavu geologického 45, 291-294.

Hirmer, M. 1927. Handbuch der Pälaobotanik. Band I: Thallophyta, Bryophyta, Pteridophyta. 724 pp. R. Oldenburg Verlag, Munchen & Berlin.

Leary, R. 1981. Early Pennsylvanian geology and paleobotany of the Rock Island County, Illinois area. Part 1: Geology. Illinois State Museum, Report of Investigation, 37.

Leary, R. & Mickle, J.E. 1989. Porostrobus nathorstii, sp. nov.: a new species of lycopsid cone from the early Pennsylvanian of Illinois. American Journal of Botany 76, 1638-1645. View article

Leary, R.L. & Trask, C.B. 1985. Early Pennsylvanian paleotopography and depositional environments, Rock Island County, Illinois. Illinois State Geological Survey Guidebook 18, 1-42.View article

Lindley, J. & Hutton,W. 1833. The fossil flora of Great Britain I. 218 pp. J. Ridgway, London.

Littke, R. 1987. Petrology and genesis of Upper Carboniferous seams from the Ruhr region, West Germany. International Journal of Coal Geology 7, 147-184. View article

Nathorst, A.G. 1894. Zur fossilien Flora der Polander. I. Zur palaozoischen Flora der Arktischen Zone. Kongliga Svenska Vetenskaps-Akademiens Handlingar 26, 1-80.

Nathorst, A.G. 1904. Sur la flore fossile regions antarctiques. Compte Rendu de la Academie des Sciences Paris 138, 1447-1450.

Nathorst, A.G. 1914. Zur fossilien Flora der Polarlander I(4): Nachträge zur paläozoischen Flora Spitzbergens. 110 pp. Norstedt & Söner, Stockholm.

Opluštil, S., Bek, J. & Schultka, S. 2010. Re-examination of the genus Omphalophloios White, 1893 from Upper Silesian Basin. Bulletin of Geosciences 85(1), 123-136.

Opluštil, S., SÝkorovÁ, I. & Bek, J. 1999. Sedimentology, coal petrology and palynology of the Radnice Member in the S-E part of the Kladno-Rakovník Basin, Central Bohemia (Bolsovian). Acta Universitatis Carolinae, Geologica 43, 599-623.

Pierart, P. 1968. Les associations de microspores et de megaspores dans une couche (couche 70 de Beeringen) du Westphalien A superieur de la Campine (Belgique). Review of Palaeobotany and Palynology 7, 275-283. View article

Punt, W., Hoen, P.P., Blackmore, S., Nilsson, S. & Le Thomas, A. 2007. Glossary of pollen and spore terminology. Review of Palaeobotany and Palynology 143, 1-81. View article

Prantl, K.A.E. 1874. Lehrbuch der Botanik. 498 pp. W. Engelmann, Leipzig.

PurkyňovÁ, E. 1970. Die Unternamurflora des Beckens von Horní Slezsko (ČSSR). [The lower Namurian flora of the Upper Silesian Basin, Czechoslovakia.] Paläontologische Abhandlunge Paläobotanik, Abteilung B 3(2), 129-268.

Scott, D.H. 1909. Studies in Fossil Botany, 2nd edition. 552 pp. A. & C. Blafl Ltd., London.

Smith, A.H.V. 1962. The palaeoecology of Carboniferous peats based on the miospores and petrography of bituminous coals. Proceedings of the Yorkshire Geological Society 33, 423-474. View article

Smith, A.H.V. & Butterworth, M.A. 1967. Miospores in the coal seams of the Carboniferous of Great Britain. Special Papers in Palaeontology 1, 1-324.

Strehlau, K. 1990. Facies and genesis of Carboniferous coal seams of Northwest Germany. International Journal of Coal Geology 15, 245-292. View article

Stubblefield, S.P. & Rothwell, G.W. 1981. Embryogeny and reproductive biology of Bothrodendrostrobus mundus (Lycopsida). American Journal of Botany 68(5), 625-634. View article

Šusta, V. 1928. Stratigrafie des Ostrau-Karviner Steinkohlenreviers im lichte der Palaontologie. Der Köhlenbergau des Ostrau-Karviner Steinkohlenreviers I, 385-484.

Thomas, B.A. 1997. Upper Carboniferous herbaceous lycopsids. Review of Palaeobotany and Palynology 95, 129-153. View article

Thomas, B.A. 2005. A reinvestigation of Selaginella species from the Asturian of the Zwickau coalfield, Germany and their assignment to the new sub-genus Hexaphyllum. Zeitschrift der Deutschen Gesellschaft für Geowissenschaften 156(3), 1-12. View article

Wagner, R.H., Brousmiche-Delcambre, C. & Coquel, R. 2003. Una Pompeya Paleobotanica: historia de una marisma carbonifera sepultada por cenizas volcanicas, 448-475. In Nuche, R. (ed.) Separata de Patrimonio Geológico de Castilla-La Mancha. Enresa, Madrid.

Watson, D.M.S. 1908. The cone of Bothrodendron mundum. Memoires of the Manchester Literary and Philosophical Society 52, 1-15.