英语语法分析

The female archesporium differentiates from the single cell under the epidermis of nucellus.

雌性孢原处于珠心表皮之下，为单细胞。

Megasporogenesis and Female Gametogenesis: Archesporium is of one cell, it directly functions as macrospore mother cell.

大孢子和雌配子体发生：孢原为一个细胞，它直接起大孢子母细胞功能。

A single archesporium differentiates immediately below the nucellar epidermis, it functions directly the megaspore mother cell.

孢原细胞处于珠心表皮之下，直接起大孢子母细胞的功能。