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.

 
  • 維管形成層屬于側生分生組織,包括能夠產(chǎn)生次生木質(zhì)部與次生韌皮部的紡錘狀形成層原始細胞和產(chǎn)生髓射線(xiàn)的射線(xiàn)原始細胞。
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