表皮可分二层：上表皮和内表皮。
上表皮致密，较薄，厚度均匀。
The epicuticle i3 dense and relatively uniform in thickness.
上表皮致密，较薄，厚度均匀。
The epicuticle is dense and relatively uniform in thickness.
上表皮气孔指数的变化规律不明显；
The stomatal index in the adaxial epidermis changed variably during development of cotyledons.
叶上表皮细胞常呈乳突状。
正对主脉的上表皮凹陷处均有泡状细胞。
The bulliform cells were situated in groove of upper epidermis facing the main vein.
叶上表皮有盐腺；
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；
The upper epidermis, palisade tissues and leaves are all thinner, so the leaves are more tender, and its yield is 8% higher;
同一叶片其下表皮气孔密度大于上表皮，试管苗与土培苗两者叶片下表皮气孔密度差异不显著。
Stomata densities of same type leaf under epidermal are higher than upper epidermal, but were not significantly different between test-tube seedling and land seedling.
上表皮下方有2-3层长柱形的栅栏组织，在主脉大侧脉外方具有由大量机械组织组成的束帽或束鞘。
There are 2-3 layers of long-column-shaped palisade tissue under the upper epidermis, and there are a great number of mechanical tissues which made up of vascular bundle sheath .
上表皮下方有2-3层长柱形的栅栏组织，在主脉大侧脉外方具有由大量机械组织组成的束帽或束鞘。
There are 2-3 layers of long-column-shaped palisade tissue under the upper epidermis, and there are a great number of mechanical tissues which made up of vascular bundle sheath .
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