spongy mesophyll

With increasing elevation, the leaf area, leaf thickness, palisade mesophyll thickness, spongy mesophyll thickness, stomatal area, epidermis cell area and pubescence density were increased, while cutin membrane thickness, epidermis cell density, pubescence length, and stomatal density were decreased.

mm-2.随海拔升高叶面积、叶厚度、栅栏组织和海绵组织的厚度、气孔器面积、表皮细胞面积以及表皮毛密度呈增加趋势，而角质膜厚度、表皮细胞密度和表皮毛长度则呈减小趋势；

There are three types of chloroplast-containing cells: palisade mesophyll cells, spongy mesophyll cells, guard cells.

在叶片中，有叶绿体的细胞包括三种：栅状叶肉细胞、海绵叶肉细胞、保卫细胞。

Under the second leaf buds had differentiated mesophyll palisade tissue and spongy tissue.

芽下第二叶的叶肉已经分化出栅栏组织和海绵组织。