. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. Fig. 344. t Dipteris Lobbiana (Hook.), Moore. Parts of two pinnae, showing narrow form, venation, and regular disposition of the sori. Natural size. Fig. 34s. From a specimen collected by Capt. Hope, , on the " China Station," but without exact locality: recognised as Dipteris quinguefurcata, Baker. Pinna showing greater width, and sori arranged below in two lateral series as in D. Lobbiana, but spreading out upwards, with many fissions, over the more extended surface. Natural size. the
. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. Fig. 344. t Dipteris Lobbiana (Hook.), Moore. Parts of two pinnae, showing narrow form, venation, and regular disposition of the sori. Natural size. Fig. 34s. From a specimen collected by Capt. Hope, , on the " China Station," but without exact locality: recognised as Dipteris quinguefurcata, Baker. Pinna showing greater width, and sori arranged below in two lateral series as in D. Lobbiana, but spreading out upwards, with many fissions, over the more extended surface. Natural size. the result has been brought about, viz. by fission. This process, so clearly seen in the few species of this very natural genus, has probably occurred also in other types of Ferns. It is suggested by Kaulfussia among the Marattiaceae, but much more obviously in various lines of the Polypodiaceae. It will have to be reckoned with in any general conception of the phylogeny of the leaf in Ferns. Examining the sorus itself, it is composed of a number of sporangia, and numerous glandular hairs are associated with them. The sporangia. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bower, F. O. (Frederick Orpen), 1855-1948. London, Macmillan and Co. , Ltd.
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