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XVIII.—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*

Published online by Cambridge University Press:  30 May 2017

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

Tristichia ovensi is a Lower Carboniferous Pteridosperm known from both petrifactions and compressions. The stems possess a triradiate protostele and some show secondary xylem. The petioles have a butterfly-shaped trace and dichotomize repeatedly forming very slender axes sometimes bearing minute terminal pinnules similar to those of Moresnetia zalesshyi Stockmans. Associated with Tristichia are seeds and cupules of Stamnostoma huttonense and less frequently compressions of seeds borne terminally on very fine dichotomous pedicels.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 64 , Issue 18: 1960-1961 “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 , 1961 , pp. 477 - 489
Copyright
Copyright © Royal Society of Edinburgh 1961

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Footnotes

*

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

References

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