孢子细胞的

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，直接起大子母细胞功能。

Tapetum (pl. tapeta) A food-rich layer surrounding the spore mother cells in the anthers of vascular plants.

维管植物花粉囊内包围子母细胞富含营养物质一层结构。