是由次生分生组织新形成的组织之总称。见于进行次生增粗生长的裸子植物和木本双子叶植物。
木材形成是一个复杂的生物学过程，是维管形成层生长和分化出次生组织的结果。
Wood formation is a complex process composing many biological events, occurs as a result of growth and differentiation of the vascular cambium.
次生木质部由孔纹导管、 薄壁组织及射线所组成。
Secondary xylem consists of pitted vessels, parenchyma fibers and rays.
结果表明，移山参主根结构由周皮和次生维管组织组成。
The results showed that the taproots of transplanted P. ginseng plants consist of periderm and secondary vascular tissue.
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