Summary

Transactions of the Linnean Society of London (1851)

I may remark, however, that in its scalariform vessels it agrees with all the fossil genera supposed to be Acotyledonous. In the structure of its sporangia and sporules it approaches most nearly, among recent tribes, to Lycopodiaceæ, and Ophioglosseæ; and among fossils, no doubt, to Lepidostrobus, and consequently to Lepidodendron.
The stem structure of Lepidodendron, known to me only in one species, Lepidodendron Harcourtii, offers no objection to this view, the vascular arrangement of the axis of its stem bearing a considerable resemblance to that of Triplosporite.
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Transactions of the Linnean Society of London (1851)

The structure of the axis, which is well preserved in the specimen, distinctly shows, in the arrangement of its vascular bundles, a preparation for the supply of an equal number of bracteæ. These vascular fasciculi are nearly equidistant in a tissue of moderately elongated cells.
The vessels are exclusively scalariform, very closely resembling those of the recent Ferns and Lycopodiaceæ; and among fossils, those of Psarolites, Lepidodendron, and its supposed fruit, Lepidostrobus, as well as several other fossil genera
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Transactions of the Linnean Society of London (1851)

To the argument derived from an agreement in structure between axis of stem and of strobilus I attach considerable importance, an equal agreement existing both in recent and fossil Coniferæ. In conclusion I have to state, that very recently (since the drawings were completed, and as well as the specimens seen by such of my friends as were interested in fossil botany) Dr. Joseph Hooker has detected in the sporangia of a species referred to Lepidostrobus sporules, and those also united in threes.
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