| 释义 |
〔nucellus〕The central portion of an ovule in which the embryo sac develops; the megasporangium.珠心：胚珠的中心，胚芽囊在此发育；大孢子囊〔megasporangium〕A structure that produces one or more megaspores. Also called macrosporangium 大孢子囊：产生一个至多个大孢子的结构 也作 macrosporangium〔megasporophyll〕A leaflike structure that bears megasporangia.（植）大孢子叶：带有大孢子囊的叶形结构 |