. A manual of botany. Botany. TISSUE SYSTEMS 347 The number of bundles in a stele varies greatly. They are usually very numerous in the stems of Monocotyledons {fig. T27), few in those of Dicotyledons {fig. 726) and Cryptogams {fig. 729), or there may be only one, as in the separate steles of schizostelic, and the smaller steles of polystelic, stems. According to the mode of arrangement of the wood and bast. Fig. Fig. 732. Collateral bundle from stem of a Jlonocotyledon. jiJi. Pliloom. :r. Xylem vessels, Protophloem. The bundle is surrouiifled by a small-celled sheatli of scleren
. A manual of botany. Botany. TISSUE SYSTEMS 347 The number of bundles in a stele varies greatly. They are usually very numerous in the stems of Monocotyledons {fig. T27), few in those of Dicotyledons {fig. 726) and Cryptogams {fig. 729), or there may be only one, as in the separate steles of schizostelic, and the smaller steles of polystelic, stems. According to the mode of arrangement of the wood and bast. Fig. Fig. 732. Collateral bundle from stem of a Jlonocotyledon. jiJi. Pliloom. :r. Xylem vessels, Protophloem. The bundle is surrouiifled by a small-celled sheatli of sclerenchvma. Alter Kny. we have several types of vascular bundle. The two principal ones are the collateral and the concentric. Collateral Bundles.—"We distinguish again two kinds of these, one characteristic chiefly of the stems of Gymnosperms and Dicotyledons, the other of those of Monocotyledons. In the first variety the bundle is roughly wedge-shaped, and the bast is placed behind the wood {figs. 731, and 743, b). The. 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 Green, J. Reynolds (Joseph Reynolds), 1848-1914. London, J. & A. Churchill
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