. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. Fig 299. A~a representation of a portion of the xylem-ring of Osmltnda rcgalis seen from without; /7 = cut end 01 a departing leaf-trace; /^ = leaf-gap. (After Lachmann, from Kidston and Gwynne-Vaughan.) £=a representation of a portion of the xylem-ring of Todea barbara, seen from without. Lettering as above. (After Seward and Ford, from Kidston and Gwynne-Vaughan.) neighbourhood of the branchings of the axis. There are good grounds for doubting whether the local and inconstant occurrence of internal
. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. Fig 299. A~a representation of a portion of the xylem-ring of Osmltnda rcgalis seen from without; /7 = cut end 01 a departing leaf-trace; /^ = leaf-gap. (After Lachmann, from Kidston and Gwynne-Vaughan.) £=a representation of a portion of the xylem-ring of Todea barbara, seen from without. Lettering as above. (After Seward and Ford, from Kidston and Gwynne-Vaughan.) neighbourhood of the branchings of the axis. There are good grounds for doubting whether the local and inconstant occurrence of internal phloem and endodermis will bear the weight of a far-reaching theory of reduction : the question has been argued sufficiently elsewhere,3 on grounds of anatomical comparison of living forms, and without acceptance of the reduction theory. Even on grounds of physiological probability it would appear less likely that a robust and large-leaved phylum of Ferns should show a reduced vascular system in its stock than that the stock should retain a primitive, though perhaps imperfectly efficient system. Apart, however, from such questions of probability, a good basis for ' Phil. Trans, vol. exev., p. 119, etc. - " Anatomy of the Osmundaceae," Bo/. Gas., 1901, p. 381. "Scott, Now Pkytohgist, vol.' i., p. 209; Seward, , p. 255; Boodle, Ann. of Bot., 1903, p. 51S ; Chandler, Ann. of Bot., 1905, p. 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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