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I.—On the Structure of some Petioles associated with Rhetinangium Gordon*

Published online by Cambridge University Press:  06 July 2012

Albert G. Long
Albert G. Long
Affiliation:
Berwickshire High School, Duns
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Synopsis

Detached petioles and their branches are described under the name Lyginorachis arberi sp. nov. In their anatomy they resemble the petioles of Rhetinangium arberi Gordon, a presumed Pteridosperm. Two specimens show preparation for dichotomy. Others are interpreted as rachides probably formed by dichotomy of petioles. In cross section such rachides show the presence of pinna-traces arising alternately and marginally from the V-shaped vascular bundle. The pinna bundles are also V-shaped but have only three corrugations in section. Cylindrical pinnules are borne on the pinnæ.

L. kidstoni sp. nov. is a smaller petiole with a less corrugated and C-shaped vascular bundle. Both species are associated with seeds of Genomosperma.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 66 , Issue 1 , 1964 , pp. 1 - 7
Copyright
Copyright © Royal Society of Edinburgh 1964

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References

References to Literature

Calder, M. G., 1935. “Further Observations on the Genus Lyginorachis Kidston”, Trans. Roy. Soc. Edin., 58, 549–559.Google Scholar
Crookall, R., 1931. “The Genus Lyginorachis Kidston”, Proc. Roy. Soc. Edin., 51, 27–34.Google Scholar
Gordon, W. T., 1912. “On Rhetinangium arberi, a New Genus of Cycadofilices from the Calciferous Sandstone Series”, Trans. Roy. Soc. Edin., 48, 813–825.Google Scholar
Long, A. G., 1960. “On the Structure of Calymmatotheca kidstoni Calder (emended) and Genomosperma latens gen. et sp. nov. from the Calciferous Sandstone Series of Berwickshire”, Trans. Roy. Soc. Edin., 64, 29–44.Google Scholar