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II.—On a Specimen of Psilophyton robustius Dawson, from the Lower Devonian of Canada*

  • C. A. Hopping (a1)
Synopsis

An account is given of the species Psilophyton robustius and the relevant literature is reviewed. There follows an illustrated description of a relatively well-preserved fertile, branched specimen. The morphological features of this specimen are discussed with reference to the earlier descriptions by Dawson and others. It has been found necessary to institute a new genus as Psilophyton is now apparently inappropriate for this species. The name given to this new genus is Trimerophyton, which includes the one species Trimerophyton robustius (Dawson) Hopping.

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*

This paper was assisted in publication by a grant from the Carnegie Trust for the Universities of Scotland.

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References
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Bower, F. O., 1935. Primitive Land Plants. London.
Croft, W. N., and Lang, W. H., 1942. “The Lower Devonian flora of the Senni beds of Monmouthshire and Breconshire”, Phil. Trans., Ser. B. 231. 131163.
Dawson, J. W., 1859. “On fossil plants from the Devonian rocks of Canada”, Quart. J. Geol. Soc., 15, 477488.
Dawson, J. W., 1862. “On the flora of the Devonian Period in North-Eastern America”, Quart. J. Geol. Soc., 18, 296330.
Dawson, J. W., 1871. “The fossil plants of the Erian (Devonian) and Upper Silurian formations of Canada”, Geol. Surv. Canada, I, 192.
Dawson, J. W., 1882. “The fossil plants of the Erian (Devonian) and Upper Silurian formations of Canada”, Geol. Surv. Canada, 2, 96142.
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Halle, T. G., 1916. “Lower Devonian plants from Röragen in Norway”, K. Svenska. VetenskAkad. Handl., 57, 146.
Halle, T. G., 1936. “On Drepanophycus, Protolepidodendron, Protopteridium, with notes on the Palæozoic flora of Yunnan”, Palœont. Sinica, Ser. A, I, fasc. 4. 128.
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Kidston, R., 1903. “The fossil plants of the Carboniferous rocks of Canobie, Dumfriesshire, and parts of Cumberland and Northumberland”, Trans. Roy. Soc. Edin., 40, 741833.
Kräusel, R., and Weyland, H., 1926. “Beiträge zur Kenntnis der Devon flora. II”, Abh. Senckenb. Naturf. Ges., 40, 113155.
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Kräusel, R., and Weyland, H., 1932. “Pflanzenreste aus dem Devon. V”, Sonderab. aus Sencken-bergiana, 14, 391406.
Lang, W. H., 1926. “Contributions to the study of the Old Red Sandstone flora of Scotland. Ill, etc.”, Trans. Roy. Soc. Edin., 54, 491521.
Lang, W. H., 1931. “On the spines, sporangia, and spores of Psilophyton princeps Dawson, shown in specimens from Gaspé”, Phil. Trans., Ser. B, 219, 421442.
Lang, W. H., 1932. “Contributions to the study of the Old Red Sandstone flora of Scotland. VIII, etc.”, Trans, Roy. Soc. Edin., 57, 491521.
Solms-Laubach, H. Graf Zu, 1891. Fossil Botany, being an Introduction to Palœophytology from the standpoint of the Botanist. Oxford.
Stolley, E., 1925. “Die Psilophyton”, Jahres. Niedersächs. Geol. Ver. Hanover, 18, 112126.
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Proceedings of the Royal Society of Edinburgh, Section B: Biological Sciences
  • ISSN: 0269-7270
  • EISSN: 2053-5910
  • URL: /core/journals/proceedings-of-the-royal-society-of-edinburgh-section-b-biological-sciences
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