Synopsis Lyginorachis papilioKidston is shown to possess separate vascular bundles at its base like the leaf-trace inPitys dayiGordon. 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 ofTristichia ovensiin the dichotomy. L. papiliois considered to be a petiole ofPitysandT. ovensithe fertile region of the frond bearingStamnostomacupules.
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Albert G. Long (1963) studied this question.
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