. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. 57° SECONDARY CHANGES. the root of Polygala Senega' belongs to this series : here, as a rule, the wood grows strongly in thickness only in one approximate longitudinal half, the bast in the other. The former, as seen in transverse section, attains the form of a half-circle with the periphery turned towards its stronger growing side, or of a circle with a broad piece cut out of' it on the weaker side. The transverse section of the bast appears as a narrow segment of a ring surrounding the more st
. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. 57° SECONDARY CHANGES. the root of Polygala Senega' belongs to this series : here, as a rule, the wood grows strongly in thickness only in one approximate longitudinal half, the bast in the other. The former, as seen in transverse section, attains the form of a half-circle with the periphery turned towards its stronger growing side, or of a circle with a broad piece cut out of' it on the weaker side. The transverse section of the bast appears as a narrow segment of a ring surrounding the more strongly grown half of the wood, on the other side as a large segment of an ellipse. In the dried root the stronger band of bast projects as the well-known keel. Sect. 183. The inequalities in question appear in much more characteristic form in the stems of lianes with deeply grooved wood, and with bast^plates which project into the grooves: Bignoniacese, Phytocrene, and others to be named below. In the climbing ^2^w«za«« ^, Figs. 224—226, the secondary growth of wood and bast is derived from a normal ring of cambium, and begins with the formation of a zone of wood and bast, of normal structure and equal thickness all round,. 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
