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leaf scar : ウィキペディア英語版
leaf scar
A leaf scar is the mark left by a leaf after it falls off the twig. It marks the site where the petiole attached to the stem. A leaf scar is found where a plant branches.
==Formation==
Leaf scars are formed naturally at the end of the growing season for deciduous plants when a layer of cells called the absciss layer forms between the petiole and stem. The absciss layer acts as a point of cleavage and the leaf breaks off leaving a cleanly shaped scar. Stipules may also leave their own scars if they are present. 〔(【引用サイトリンク】url=http://osupress.oregonstate.edu/book/winter-twigs/intro )

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「leaf scar」の詳細全文を読む



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