. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. FIG. 159.—Cycas revoluta (223). Longitudinal section througli a similar bundle ot the same leaf-stalk, in the direction r—r, Fig. 15S. The letters have the same meaning as in that figure. « reticulated tracheide with narrow slits ; the fibres of the narrowest (first) spiral tracheide are distorted. sharply limited both inside and out, which consists of short, wide, angular elements [c c), with pitted or narrowly reticulated walls, and cavities often filled up by large crystals of Calcium oxalate
. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. FIG. 159.—Cycas revoluta (223). Longitudinal section througli a similar bundle ot the same leaf-stalk, in the direction r—r, Fig. 15S. The letters have the same meaning as in that figure. « reticulated tracheide with narrow slits ; the fibres of the narrowest (first) spiral tracheide are distorted. sharply limited both inside and out, which consists of short, wide, angular elements [c c), with pitted or narrowly reticulated walls, and cavities often filled up by large crystals of Calcium oxalate. In the other species investigated, there is no sheath which can be sharply distinguished from the surrounding parenchyma ; at most some of the sclerenchymatous fibres, which are scattered through the whole tissue, stand around the periphery of the bundle. According to Russow ^, the feeble leaf-bundles of Isoetes closely approach those of the Cycadese as regards structure. They are collateral and their orientation is normal. Their xylem consists of narrow prismatic parenchymatous cells, with ,some narrow, spiral, and reticulated tracheides standing between them. The primitive elements appear, according to Russow, on the boundary of the phloem, while the others, which are nearer the inner edge of the bundle, attain their development later. On the inside of the phloem thin-walled prismatic elements can be distinguished, but ' Mettenius, p. 573, Taf. i, fig. 10. /.cpp. 140, 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
