栅栏组织和海绵组织细胞内叶绿体数量变得更少, 海绵组织细胞中大部分几乎没有叶绿体存在.

The number of chloroplast was much less, especially in spongy tissue, chloroplast hardly could been observed.

叶肉细胞同型，无栅栏细胞和海绵组织的分化；

There is no differentiation among mesophyll cells (no differentiation of palisade tissue and spongy tissue).

最小的脉是直接和栅栏组织及海绵组织的绿色组织相联结。

The smallest veins are in direct contact with chlorenchyma, both palisade and spongy tissue.

最小的脉是直接和栅栏组织及海绵组织的绿色组织相联结。

The smallest veins are in direct contact with chlorenchyma , both palisade and spongy tissue.

叶肉栅栏组织、海绵组织和叶片的总厚度均随海拔升高而增大，并普遍形成发达的通气组织。

With the altitude increasing, the thickness of the leaves, palisade and spongy tissue increased, and all of them had well-developed aerenchyma.

叶对生、大型，栅栏、海绵组织分化明显。

The leaf is large and opposite, its palisade and sponge tissue distinguish clearly.