. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. FIG. 172.—Psoralea bituminosa (40). Ultimate ramifications of the bundles in a piece of a leaflet; at r is the edge of the latter. FIG. 173 {225).—Ultimate ramifications of vascular bundles from the leaf-lamina of Psoralea bituminosa; branched rows of tracheides, the ends marked X being torn off, the others terminating free. The whole branched row is surrounded by large cells containing chlorophyll; outside these are the circular transverse sections of some cells of the dense pahsade parenchyma
. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. FIG. 172.—Psoralea bituminosa (40). Ultimate ramifications of the bundles in a piece of a leaflet; at r is the edge of the latter. FIG. 173 {225).—Ultimate ramifications of vascular bundles from the leaf-lamina of Psoralea bituminosa; branched rows of tracheides, the ends marked X being torn off, the others terminating free. The whole branched row is surrounded by large cells containing chlorophyll; outside these are the circular transverse sections of some cells of the dense pahsade parenchyma of the leaf. one, or of quite a few rows of tracheal elements (Figs. 174, 175). The leaf of Welwitschia is to be mentioned as an exception to the rule, for its very numerous transverse branchlets (comp. Fig, 145, p. 303) have, so far as can be determined, the structure of complete vascular bundles provided with a multiseriate xylem and phloem, and it is only the short, thick, free-ending branches, springing partly from the angles of the cross-branchlets and partly direct from the longitudinal bundles, which consist exclusively of tracheides, the latter being inserted between the elements of the surrounding parenchyma. As follows from what has been stated, the ultimate vascular branches often border directly on the parenchyma which in the lamihse of foliage-leaves contains. 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
