大孢子

The ovule is bitegminous and tenuinucellate.The archesporial cell locates under the nucellus epidermis, which develops into fuctional megasporocyte.

原细胞位于珠心表皮之下，直接起大母细胞的功能。

Macrospore metrocyte of Pinus sylvestris var. mongolica developed to female gametophyte containing female gamete-egg by a series of changes.

摘要樟松大母细胞列变化，发育成雌体。

The carpel is homologous with the megasporophylls of certain spore-bearing vascular plants (pteridophytes) and the ovuliferous scales of gymnosperms.

心皮和能产的维管植物（羊齿类）还有具胚珠的裸植物的大叶是同源的。