. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. 626 GENERAL COMPARISON OF THE FILICALES i Examples illustrating that this has actually occurred have already been seen in the living Marattiaceae; while Angiopteris and Marattia have upright and radial stocks, that of Danaea becomes oblique or even prone as it grows older, and Kaulfussia, with its longer internodes, is a creeping form. In all of these, however, where the embryo is known, the shoot is in the first instance erect. It seems plain that there has been a transition from the upright and radi
. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. 626 GENERAL COMPARISON OF THE FILICALES i Examples illustrating that this has actually occurred have already been seen in the living Marattiaceae; while Angiopteris and Marattia have upright and radial stocks, that of Danaea becomes oblique or even prone as it grows older, and Kaulfussia, with its longer internodes, is a creeping form. In all of these, however, where the embryo is known, the shoot is in the first instance erect. It seems plain that there has been a transition from the upright and radial to the prone and dorsiventral type. In the living representatives of those sequences of Ferns which culminated in the Leptosporangiate group dorsiventrality is more common, and it is already seen to be prominent in such early types as the Schizaeaceae, Gleicheniaceae, and Matonineae, though the Cyatheae and Dicksonieae are strongly radial. There is some reason on anatomical grounds for thinking that the living Hymenophyllaceae show in their radial types a recovery of. 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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