Abstract
From a study of the anatomy of the different regions of the plant, evidence is found of the relationship of the Araucarineæ to the Cordaitales. In the first place, the presence of a leaf gap opposite the outgoing foliar trace, in all forms whether the leaf be large or small, is taken as indicating the Pteropsid ancestry of these forms and is considered of sufficient importance to preclude the possibility of the Lycopsid connection of the Araucarineæ, of which view Seward has been the recent exponent. The presence of a gap in the cone and in the seedling seems to put the question beyond doubt, since this indicates the ancestral presence of a leaf gap.
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More From: Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character
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