The gametophyte is derived from the product of a reduction division in the megaspore mother cell.
该配子体是由大孢子母细胞进行减数分裂而来.
A single archesporium differentiates immediately below the nucellar epidermis, it functions directly the megaspore mother cell.
孢原细胞处于珠心表皮之下, 直接起大孢子母细胞的功能.
Megaspore tetrad is linear. The chalazal megaspore develops into an embryo sac of Polygonum type.
大孢子四分体为线形, 合点端功能大孢子发育成为蓼型胚囊.