大孢子

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

孢原位于珠心表皮之下，直接起大孢子。

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

心皮和产生孢子维管植物（羊齿类）还有具胚珠裸子植物大孢子叶是同源。

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

摘要樟子松大孢子经一系列变化，发育成雌配子体。