. Botany for high schools and colleges. Botany. 444 BOTANY. bundles are more numerous. In such a stem it is evident that there can be no considerable increase in thickness after it is once formed, and we consequently find that palms take a long time for the formation of a broad bud or growing point {2mnciu7ri vegetationis), and afterward push up a cylin- drical stem in which little change subsequently takes place. In the Dragon trees (Dracmia, sp.) artd some other Monoco- tyledons, there is a thick layer of paren- chymatous cortex be- tween the column of fibro-yascular bundles and the epidermi
. Botany for high schools and colleges. Botany. 444 BOTANY. bundles are more numerous. In such a stem it is evident that there can be no considerable increase in thickness after it is once formed, and we consequently find that palms take a long time for the formation of a broad bud or growing point {2mnciu7ri vegetationis), and afterward push up a cylin- drical stem in which little change subsequently takes place. In the Dragon trees (Dracmia, sp.) artd some other Monoco- tyledons, there is a thick layer of paren- chymatous cortex be- tween the column of fibro-yascular bundles and the epidermis (Fig. 322, r), and in the deeper layers of this a persistent meri- stem tissue is found (Pig. 322, x). In this meristem there are formed fibro-vascular bundles,which lie par- allel to those already formed, and in this way the stem slowly increases in thickness. 545.âIn those Di- cotyledons whose Fig. 323.âCross-sectioB of ptem of Draccena. e, , epidermis; k. corlt; )â , cortex ; b, a flbro-Tasciilai- StCmS increase lU bundle bending out to a leaf ; m, pareuchyma of the ,-i ⢠i , i i fundamental system ; g, g, fibro-vaecular bundles ; tUlCKneSS there always ip, meristem zone of tne fundamental system in ^rt,r«i^, c!^^« o Ioxt^i. â whicli new bundles and tissues are forming.âAfter ueveiops SOOn a layei ®'"^''^' of meristem tissue, which connects the cambium layer of one fibro-vascular bundle with that of the other (Fig. 323). This is made easier from the fact that in most (but not all) Dicotyle- dons the bundles lie at nearly the same depth beneath the epidermis on all sides of the stem, thus forming a cylinder, or in cross-section, a ring, as in Fig. 323. Both the fascicu-. 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 Bessey, Charles E. (Charles Edwin), 1845-1915. New York : H. H
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1888
