The cell wall has undergone secondary thickening, and is often lignified. 細胞壁多發(fā)生木質(zhì)化而次生加厚。
It may develop by thickening of the secondary walls of parenchyma cells, or it may arise directly from meristematic cells. 它們可能由薄壁組織的細胞壁次生加厚而成，也可能直接來(lái)自于分生組織細胞。
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