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Observations on the Lower Carboniferous genus Pitus Witham

Published online by Cambridge University Press:  06 July 2012

Albert G. Long
Albert G. Long
Affiliation:
Hancock Museum, Newcastle upon Tyne
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Synopsis

Past work on the genus Pitus is reviewed and evidence adduced in favour of the view that it was a genus of arborescent Pteridosperms bearing the sterile bifurcate fronds known as Lyginorachis papilio Kidston. These probably resembled Sphenopteris affinis L. & H. in the compression state. Fertile organs were probably borne on trifurcate fronds in which a stemlike median rachis (Tristichia ovensi Long) bore synangia (Telangium sp.) composed of eight microsporangia, or alternatively seed-cupules of Stamnostoma huttonense Long. Branching in Pitus produced single branches at a wide angle, or pseudo-whorls (close spirals) of about five branches. An anomalous ring of medullary xylem was sometimes associated with branching as in Lyginopteris. This supports the view that Pitus should be classified in the Lyginopteridaceae although it was arborescent and in some respects more advanced than many of the more shrub-like Pteridosperms.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 70 , Issue 5-9 , 1979 , pp. 111 - 127
Copyright
Copyright © Royal Society of Edinburgh 1979

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References

Arnold, C. A., 1970. Traité de Paléobotanique. Ed. Boureau, E.. Fasc. IV, p. 444. Paris: Masson.Google Scholar
Babington, C. C., 1897. Memorials Journal and Botanical Correspondence, p. 31. Cambridge: Macmillan and Bowes.Google Scholar
Balfour, J. H., 1872. Introduction to the Study of Palaeontological Botany, pp. 62–64. Edinburgh: Adam and Charles Black.CrossRefGoogle Scholar
Christison, R., 1874 a. Notice of fossil trees recently discovered in Craigleith Quarry, near Edinburgh. Trans. Roy. Soc. Edinb., 27, 203–221.CrossRefGoogle Scholar
Christison, R., 1874 b. Notice of a Pinaceous Fossil recently found in Redhall Quarry, near Edinburgh. Trans. Proc. Bot. Soc. Edinb., 12, 167–174.CrossRefGoogle Scholar
Day, J. B. W., 1970. Geology of the country around Bewcastle. Mem. Geol. Surv. Gt Br., pp. 95–99. London: H.M.S.O.Google Scholar
Eggert, D. A. and Taylor, T. N., 1971. Telangiopsis gen. nov., an Upper Mississippian pollen organ from Arkansas. Bot. Gaz., 132, 30–37.CrossRefGoogle Scholar
Gordon, W. T., 1935. The Genus Pitus Witham, emend. Trans. Roy. Soc. Edinb., 58, 279–311.CrossRefGoogle Scholar
Kidston, R., 1924. Fossil plants of the Carboniferous Rocks of Great Britain. Mem. Geol. Surv. Gt Br. {Palaeontology), 2, 444–454.Google Scholar
Lacey, W. S., 1953. Scottish Lower Carboniferous Plants: Eristophyton waltoni sp. nov. and Endoxylon zonatum (Kidston) Scott from Dunbartonshire. Ann. Bot., 17, 579–596.CrossRefGoogle Scholar
Lindley, J. and Hutton, W., 1831–1837. The Fossil Flora of Great Britain, vol. 1. London.Google Scholar
Long, A. G., 1960. Stamnostoma huttonense gen. et sp. nov.—a Pteridosperm seed and cupule from the Calciferous Sandstone Series of Berwickshire. Trans. Roy. Soc. Edinb., 64, 201–215.CrossRefGoogle Scholar
Long, A. G., 1962. Tristichia ovensi gen. et sp. nov., a Protostelic Lower Carboniferous Pteridosperm from Berwickshire and East Lothian, with an account of some associated seeds and cupules. Trans. Roy. Soc. Edinb., 64, 477–489.Google Scholar
Long, A. G. 1963. Some specimens of Lyginorachis papilio Kidston associated with stems of Pitys. Trans. Roy. Soc. Edinb., 65, 211–224.CrossRefGoogle Scholar
Long, A. G., 1976. Calathopteris heterophylla gen. et sp. nov., a Lower Carboniferous Pteridosperm bearing two kinds of petioles. Trans. Roy. Soc. Edinb., 69, 329–336.Google Scholar
Macgregor, M., 1929. Scottish Carboniferous Stratigraphy: An introduction to the study of the Carboniferous Rocks of Scotland. Trans. Geol. Soc. Glasg., 18, 442–558.CrossRefGoogle Scholar
Miller, H., 1857. Testimony of the Rocks, Frontispiece and 466. Edinburgh.Google Scholar
Peach, C. W., 1878. On the cercinate vernation, fructification, and varieties of Sphenopteris affinis. Q. Jl Geol. Soc. Lond., 34, 131.CrossRefGoogle Scholar
Scott, D. H., 1902. On the primary structure of certain Palaeozoic stems with the Dadoxylon type of wood. Trans. Roy. Soc. Edinb., 40, 331–365.CrossRefGoogle Scholar
Scott, D. H., 1923. Studies in Fossil Botany, vol. 2, p. 42. London: Black.Google Scholar
Scott, D. H., 1924. Extinct Plants and Problems of Evolution, Frontispiece. London: Macmillan.Google Scholar
Seward, A. C., 1917. Fossil Plants, vol. 3, p. 254. Cambridge.Google Scholar
Witham, H. T. M., 1830. Vegetation of the first period of an ancient world. Phil. Mag., 7, 23–31.CrossRefGoogle Scholar
Witham, H. T. M., 1831. Observations on Fossil Vegetables, p. 294–301. W. Blackwood, Edinburgh, and T. Cadell, London.Google Scholar
Witham, H. T. M., 1833. The Internal Structure of Fossil Vegetables, p. 37–39. Edinburgh: Adam and Charles Black.Google Scholar