XVIII.—Tristichia ovensigen. et sp. nov., a Protostelic Lower Carboniferous Pteridosperm from Berwickshire and East Lothian, with an Account of some Associated Seeds and Cupules

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Abstract
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.

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