维管形成层属于侧生分生组织，包括能够产生次生木质部与次生韧皮部的纺锤状形成层原始细胞和产生髓射线的射线原始细胞。
It is a lateral meristem and contains fusiform initials giving rise to secondary xylem and phloem and ray initials giving rise to medullary rays. See also secondary growth.
枝横切面特征中韧皮部细胞形状和排列松紧不一，木射线细胞中内含物仅云南红豆杉有。
The characters of stem transections are the differences on the size and rang of the phloem cells, the inclusions in xylem ray cells are only found from Taxus yunnanensis.
次生韧皮部有石细胞，次生木质部射线发达。
Sclereids are found in secondary phloem, and rays are rather rich in secondary xylem.
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