外胚乳 meaning in English

perisperm

Food materials may be stored in a special tissue derived from the nucellus, called the perisperm .
营养物质可以贮藏于由珠心产生的一种特殊组织，叫外胚乳。
The nutritive tissue that is derived from the nucleus and surrounds the embryo of the seed
外胚乳包在种子胚芽外，产生于细胞核的营养性组织
Their differences are based on many aspects which include characteristics of morphology , anatomy and epidermis of leaf , types of tapetum in anther walls , patterns of endothecial thickenings , and ways of development of endosperms , presence or absence of perisperm , components of photochemistry , and sequences of rbcl
菖蒲属与天南星科其它属在叶的形态、结构、表面特征，花药绒毡层类型，药室内壁增厚的特点，胚乳的发育方式，外胚乳的有无，植物化学成分， rbcl基因序列等多方面存在着显著的差异。