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X.—Some Specimens of Lyginorachis papilio Kidston Associated with Stems of Pitys*

Published online by Cambridge University Press:  17 January 2013

Albert G. Long M.Sc., F.R.E.S.
Albert G. Long M.Sc., F.R.E.S.
Affiliation:
Berwickshire High School, Duns.
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Synopsis

Lyginorachis papilio Kidston is shown to possess separate vascular bundles at its base like the leaf-trace in Pitys dayi Gordon. Vascular traces arise higher up indicating that the petiole bore one or two pairs of sub-opposite pinnæ (or pinnules). Above these the primary rachis dichotomizes into secondary rachides with traces to alternate pinnæ. One specimen is known showing the origin of an axis of Tristichia ovensi in the dichotomy.

L. papilio is considered to be a petiole of Pitys and T. ovensi the fertile region of the frond bearing Stamnostoma cupules.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 65 , Issue 10 , 1963 , pp. 211 - 224
Copyright
Copyright © Royal Society of Edinburgh 1963

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References

VII. References to Literature

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