大孢子

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

孢原细胞位于珠心下，直接起大孢子母细胞功能。

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

摘要樟子松大孢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.

心和能产生孢子维管植物（羊齿类）还有具胚珠裸子植物大孢子叶是。