幼叶橙红色，成熟叶深绿色；

Young leaf is salmon pink, mature leaf is dark green.

youdao

用透射和扫描电镜观察了蕨状满江红茎尖、成熟叶腔内以及胚的腺毛超微结构。

The ultrastructure of Azolla filiculoides was investigated by means of transmission and scanning electron microscopy .

youdao

单位叶面积的叶绿素素含量在幼叶和老叶较低而成熟叶中较高，类胡萝卜素随着叶龄的增加而增加。

Chlorophyll contents were less in young and old leaves than in mature leaves, while carotenoids were increased with leaf age.

youdao