megasporangia

megasporangia

1. The megasporangium cells before fertilization.

受精前的大孢子囊细胞。

2. The plant body resembled a fern and did not produce flowers, the seeds developing from megasporangia borne on the margins of the fronds.

在石炭纪该种植物生长繁茂，到白垩纪基本灭绝，目前仅保留有化石植物。

3. 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

4. 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

5. the megasporangium and surrounding integuments of a seed plant.

种子植物的大孢子囊及其周围的被层。

6. c. In this time period, the indehiscent integumented megasporangium (ovules/seeds) originated. It is represented in the sample by modern plants producing naked seeds on a scale.

胚珠或种子起始于此期间,开始出现在鳞片状叶上产生裸露种子的现代植物.

7. A leaflike structure that bears megasporangia.

（植）大孢子叶带有大孢子囊的叶形结构