木本植物维管形成层外部的组织。
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.
同时，运用石蜡切片法研究剥皮后愈伤组织的形成、木栓形成层和维管形成层的发生；
Meanwhile, paraffin-cut section method was used for studying on callus formation, cork cambium and vascular cambium initiation.
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