西北中生界煤系烃源岩中普遍含有木栓质体，它来源于植物周皮的木栓化细胞壁。
Suberinite occurs commonly in Mesozoic coal measures and terrestrial organic matter source rocks in Northwest China, which is formed from suberized cell walls, particularly in plant periderm.
周皮发生较迟，其木栓形成层由紧靠内皮层的皮层细胞产生。
The formation of periderm is relatively late and cork cambium is come from the cortex cells which arenear endodermis.
周皮中的木栓细胞为近方形或不规则型，口径较大，数量多，且层叠排列，最外层的木栓细胞口径大，充满了空气。
Periderm cork cells was nearly square or irregular, large caliber, large quantities, cascading arrangement. The caliber of the outermost layer of cork cells was large, filled the air.
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