叶迹从茎内维管束中分支后，其上方出现一空隙，由薄壁细胞填充，这一区域称为叶隙。
阳光穿过叶隙而闪耀。
通过实验研究提出了观察植物叶迹、叶隙立体结构的方法。
The article proposes the experimental method of observing the spatial structure of plants leaf trace and leaf crack.
茎的初生结构中多个维管束排列成环状，节部为单隙三迹，叶迹分别来自于3条维管束或同一条维管束。
The vascular bundles of the primary structure in stem are ring arranged, and the node is unilacunar and 3-traced, which is from three vascular bundles or one vascular bundle.
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