The formation of periderm is relatively late and cork cambium is come from the cortex cells which arenear endodermis.
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。
Externally pale brownish-yellow or pale brown, with irregular, longitudinal wrinkles, cork easily exfoliated, exposing yellowish-white cortex, sometimes showing reticulated fibre bundles.
表面为浅棕黄色或浅棕色，有不规则纵皱纹和众多横长皮孔样突起，栓皮易剥落而露出黄白色皮部，有时可见网状纤维束。
Externally pale brownish-yellow or pale brown, with irregular, longitudinal wrinkles, cork easily exfoliated, exposing yellowish-white cortex, sometimes showing reticulated fibre bundles.
表面为浅棕黄色或浅棕色，有不规则纵皱纹和众多横长皮孔样突起，栓皮易剥落而露出黄白色皮部，有时可见网状纤维束。
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