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，直接子母细胞功能。

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

摘要樟子松子母细胞经一系列变化，发育成雌子体。

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

心皮和能产生子维管植物（羊齿类）还有具胚珠裸子植物子叶是同源。