. L'anatomie comparée des organes végétatifs des phanérogames marines et de fougères ;. Anatomie végétale ; Fougères. Fig. 62.-Juniperus communis ; feuille, section transversale (600), / parenchy- cellule matous ; à côté tracheides de l'angle de l'option -asrular offre groupée avec bor- comme des puits, et reticulately-ramifiées barres transversales. Les pièces se trouvant- au-dessous de la surface de l'article l'accent sont ombrées. FIG. 63.-La même (225) ; faisceau vasculaire, ff, xylème csingle sclerenchymatous fibre à la limite extérieure du phloème ; t marg^dans composé d'tracheides avec aréolées et barres transversales. Les cellules parenchymateuses près de

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. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. Fig. 62.—Juniperus communis; leaf, transverse section (600), / parenchy- matous cell; next to it tracheides of the corner of the -asrular bundle, with bor- dered pits, and reticulately-branched transverse bars. The parts lying- below the surface of section focussed are shaded. FIG. 63.—The same (225); vascular bundle, ff xylem, csingle sclerenchymatous fibre at the outer limit of the phloem; t marg^in consisting of tracheides with bordered pits and transverse bars. The parenchymatous cells near and between the latter are shaded with dots. , Further details on the structure of the walls of the Trachea will be described in later chapters, especially the Vlllth and XIVth. Sect. 40. The wall of the Tracheas, whatever be its structure, is in the one series of cases a completely closed membrane {Tracheides) ; or it is broken through at the limiting surfaces between elements placed serially one above another, and originally completely closed, the series thus coalescing to a continuous tube, which is called a vessel. The tracheides therefore differ from the vessels only in the absence of the holes which occur in certain of the walls, and thus connect the cell-cavities. Tran- sitions between them occur in the secondary wood of Dicotyledonous plants (comp: Chap. XIV), e. g. Leguminosae, inasmuch as with otherwise similar characters the holes are absent in one case and present in another. Holes are also to be found in Botan. Zeitg. 1863, p. 117.—Pringsheim's Jahrb. Bd. IX. p. 59.. 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 work.. 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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