. Plant life, considered with special references to form and function. Plant physiology. 86 PLANT LIFE. tinguished from the root by not forming through segmenta- tion from the outer faces of the initial cell or cells a many- layered ejudermal cap. In further contrast with the root, which often has no true ejjidermis except the root-cap, the shoot is characterized by possessing an uninterrupted epider- mis over its entire surface, consisting always at first of a single layer of cells. This epidermis persists as a surface covering either throughout the life of the shoot, or for a long [jeriod, b
. Plant life, considered with special references to form and function. Plant physiology. 86 PLANT LIFE. tinguished from the root by not forming through segmenta- tion from the outer faces of the initial cell or cells a many- layered ejudermal cap. In further contrast with the root, which often has no true ejjidermis except the root-cap, the shoot is characterized by possessing an uninterrupted epider- mis over its entire surface, consisting always at first of a single layer of cells. This epidermis persists as a surface covering either throughout the life of the shoot, or for a long [jeriod, being replaced only upon the older surfaces of the axis by subsetjuently formed protective layers. (See* i34-) 103. Branching. â I]ranches of the shoot arise from lateral buds, which are in all respects similar to the terminal buds just described. If for any reason, the terminal bud of the stem becomes de- stroyed, or its growth arrested, a branch, developing from a lateral Ijud near by, ma)' assume the position and habit of the main axis, its own normal mode of development being altered. In many ]")lants the death or arrest of the ter- minal bud recurs at regular intervals. In such plants, thereCore, the main axis is really a succession of lateral branches, KiG .,7.âShout oi Kuro- and the bran ^ , internode formed by the """ (^0- 97)- ^^ SOme plants, , bud of present season i-l * 1 , ill j. i â 1 This dies and drops off '''ac, two lateral Ijuds standing at the and the shoot will he ,1 , , â ,- 1 , â , formed next year by the samclcvel may devcloj), it the terminal last axillary bud, d, r -i r 1 â 1 1 which appears to be One lails. lu tills Case the slioot sceiiis terminal after loss of /. 1 â â , â ^ ^ , , , r,,, . Half natural size.âAfter to divide luto twoei|ual branches. Ihis, however, is not true, but false, or sv)ii- poiJial, dichotiimv. True dichotomy, like tiue dichotonu' of the root, occurs onl)- m those plants in which the axis has. Pl
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