于贝母表皮细胞垂周壁多波状弯曲。

The anticlinal wall of epidermic cell looks like waves.

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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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该属两种叶表皮形态基本一致：表皮细胞为不规则的狭长形，垂周壁波状；

The form of frond epidermis of S. grevilleoides and S. albofusca bring into correspondence with each other: the epidermis cells are irregular narrow strip with sinuous anticlinal walls;

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