. Text-book of botany, morphological and physiological. Botany. FILICINE2E. 427 The foot is an organ by which the embryo attaches itself to the tissue of the pro thallium, in order to draw nourishment from it while the first roots and leaves are being formed. The first parts of the stem and the roots and leaves, which are now developed in succession from the embryo, are very small, and remain so ; those which are formed later are gradually larger. The leaves become constantly more complex in form, and the structure of the stem more intricate as the new portions formed by its growth in length i
. Text-book of botany, morphological and physiological. Botany. FILICINE2E. 427 The foot is an organ by which the embryo attaches itself to the tissue of the pro thallium, in order to draw nourishment from it while the first roots and leaves are being formed. The first parts of the stem and the roots and leaves, which are now developed in succession from the embryo, are very small, and remain so ; those which are formed later are gradually larger. The leaves become constantly more complex in form, and the structure of the stem more intricate as the new portions formed by its growth in length increase in diameter. The first parts of the stem, like the first leaf-stalks, contain each only one axial fibro-vascular bundle; the later ones a larger number when both stem and leaf-stalk have attained a considerable thickness. In this manner the Fern continues to gain strength, not by subsequent increase of size of the embryonic structures, but by each successive part attaining a more considerable size and development than the preceding ones; until at length a kind of stationary condition is arrived at in which the newly-formed organs are nearly similar to the preceding ones. The following observations refer especially to this mature condition 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 Sachs, Julius, 1832-1897; Vines, Sydney Howard, 1849-1934. ed. and tr. Oxford, Clarendon press
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1882
