气孔器(stomatal apparatus)——结构与茎表皮的气孔器相同，通常下表皮的气孔器多于上表 皮。 气孔(stoma)：由两个肾形的保卫和它们间的孔口共同组成。
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The stomata distributed mainly in abaxial epidermis. The stomata apparatus consisted of only guard cells which are surrounded by a few un-uniform epidermal cells.
气孔密集分布在下表皮,气孔器没有副卫细胞,只是在其周围有几个不规则的普通的表皮细胞,属于无规则型。
参考来源 - 榉树生物学特性及园林应用研究·2,447,543篇论文数据，部分数据来源于NoteExpress
叶长宽比、P/S的比值、表皮厚度与气孔器密度无明显差异。
There was no significant difference in LL/LW, P/S, epidermal thickness and stomatal density along the elevation gradient.
结果表明，表皮细胞形状、垂周壁式样及气孔器类型具有重要的分类学意义。
We found that the shape of the epidermal cells, the pattern of anticlinal walls and the types of stomatal apparatuses have much taxonomic importance within the genus.
用光学显微镜和扫描电镜对合意非洲铁羽片表皮及气孔器的发育过程进行观察研究。
The ontogeny of pinna epidermis and stomatal apparatus in Encephalartos gratus Prain have been observed with LM and SEM.
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