Hostname: page-component-cd9895bd7-p9bg8 Total loading time: 0 Render date: 2024-12-23T07:28:12.045Z Has data issue: false hasContentIssue false
  • English
  • Français

15.—Calathopteris heterophylla gen. et sp. nov., a Lower Carboniferous Pteridosperm bearing Two Kinds of Petioles

Published online by Cambridge University Press:  06 July 2012

Albert G. Long
Albert G. Long
Affiliation:
Hancock Museum, Newcastle upon Tyne.
Get access Rights & Permissions [Opens in a new window]

Synopsis

Calathopteris heterophylla gen. et sp. nov. is described from a single petrified stem found in a loose block at Oxroad Bay, East Lothian. It is approximately 17 cm long and 2 cm diameter, being clothed with the swollen bases of incomplete petioles, many reflexed, and arranged in a dense 2/5 phyllotactic spiral. In most petioles the vascular bundle becomes U-shaped in transverse section with six abaxial mesarch lobes. Other leaf-traces divide in the inner cortex to form three concentric xylem strands which differentiate as they pass outward to form a median triarch bundle flanked by two tetrarch bundles. The stem possesses a medullated stele in which short wide tracheids occur in the medulla. Similarities between the petioles and those of Calathospermum fimbriatum Barnard are pointed out while those with three bundles were probably trichotomous (and ?microsporangiate) like Diplopteridium teilianum Walton.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 69 , Issue 15 , 1976 , pp. 327 - 336
Copyright
Copyright © Royal Society of Edinburgh 1976

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

References to Literature

Arnold, C. A., 1970. Traité de Paléobotanique, IV, 444–450. (Ed. Boureau, E..) Paris: Masson.Google Scholar
Benson, M., 1904. Telangium Scotti a new species of Telangium (Calymmatotheca) showing structure. Ann. Bot., 18, 161.CrossRefGoogle Scholar
Calder, M. G., 1935. Further observations on the Genus Lyginorachis Kidston. Trans. Roy. Soc. Edinb., 58, 549–559.CrossRefGoogle Scholar
Galtier, J., 1970. Recherches sur les végetaux a structure conservée du Carbonifère Inférieur Français. Paléobiologie Continentale, 1, 149–156.Google Scholar
Gordon, W. T. 1935. The genus Pitys, Witham, Emend. Trans. Roy. Soc. Edinb., 58, 279–311.CrossRefGoogle Scholar
Gordon, W. T., 1938. On Tetrastichia bupatides: a Carboniferous Pteridosperm from East Lothian. Trans. Roy. Soc. Edinb., 59, 351–370.CrossRefGoogle 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
Walton, J., 1931. Contributions to the knowledge of Lower Carboniferous Plants, Pt. III. Phil. Trans. Roy. Soc. Lond. B., 219, 347–379.Google Scholar