表皮主要保护内部组织，可分为上表皮（upper epidermis）与下表皮（lower epidermis），依植物种类的不同，约一层至数层，植物叶为适应环境，其表皮常特
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The cells of upper epidermis are often papillae.
叶上表皮细胞常呈乳突状。
The bulliform cells were situated in groove of upper epidermis facing the main vein.
正对主脉的上表皮凹陷处均有泡状细胞。
The upper epidermis, palisade tissues and leaves are all thinner, so the leaves are more tender, and its yield is 8% higher;
叶片上表皮、栅状组织和全叶均较薄，叶质柔嫩，茶叶产量平均提高8％左右；
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