于贝母表皮细胞垂周壁多波状弯曲。
周壁具有裂片状、弯裂片状或瘤状突起。
Type II is characterized by having curved-lobate , lobate or tuberculate processes on the perine.
表皮细胞和保卫细胞的长轴方向与叶脉走向一致，垂周壁平直或波形；
Epidermis cells and long axis of guard cells tend towards the same direction of venation.
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