. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. Fig. 147.âAcorus Calamus; cross-section through the periphery of the flower-stalk (145). e epidermis; b small vascular bundles, with a sclerenchymatous sheath on the outside. In the middle is a large vasculctr bundle; â ui its phloeiQ; g outer lai^e trachcEe of the xylem; / intercellular passage at the inner side of the latter. The cross-section through the leaf shows the same structure. Fig. 14S.âCross-section through the concentrically arranged lower end of a bundle of the leaf-trace in the st
. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. Fig. 147.âAcorus Calamus; cross-section through the periphery of the flower-stalk (145). e epidermis; b small vascular bundles, with a sclerenchymatous sheath on the outside. In the middle is a large vasculctr bundle; â ui its phloeiQ; g outer lai^e trachcEe of the xylem; / intercellular passage at the inner side of the latter. The cross-section through the leaf shows the same structure. Fig. 14S.âCross-section through the concentrically arranged lower end of a bundle of the leaf-trace in the stem (145). The delicate and small-meshed phloem occupies the middle, and is surrounded, by a ring of scalariform netted tracheides; outside this is parenchyma. the bundle includes all the tracheae, while another, or in rarer cases more than one other, includes all the sieve-tubes. Thus in every bundle we have to distinguish between that part which contains the tracheae (tracheides or vessels) and that which contains the sieve-tubes, or expressed more shortly, between the xylem and the phloem. In both parts the characteristic tissue-elements are as a rule not present alone, but are placed between rows or layers of cells (cf. p. 5) in such a way that all or most trachese or sieve-tubes are in contact with the latter at least at one point. It is true that in the case of very small bundles this intercalation is not uncommonly absent in the xylem; but then the few tracheae of which this consists, border, for the most part at least, on the cells which encircle the bundle. More rarely masses 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 Bary, A. de (Anton), 1831-1888; Bower, F. O. (Frederick Orpen), 1855-1948; Scott, Dukinfield Henry, 1854-1934. Oxford, Clarendon Press
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Keywords: ., bookcentury1800, bookdecad, booksubjectplantanatomy, bookyear1884