The ovule is bitegminous and tenuinucellate.The archesporial cell locates under the nucellus epidermis, which develops into fuctional megasporocyte.
原细位表皮之下,直接起大母细的功能。
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Matrix producers pump out the extracellular goo, swimmers assemble flagella and are free to move about or migrate, and spore-formers produce dormant, tough endospores that survive starvation, temperature extremes, and harmful radiation.
基质制造者能够分泌细胞外粘性物质,鞭毛可以自由活动和迁移,芽孢菌生产休眠、坚硬的孢子壁,孢子壁能够在饥饿、极端温度、以及有害射线下生存。
This meant that they were really dependent on a wet environment, otherwise the spores would fail to grow - the different reproductive cells they contained needed a thin layer of water on the plant's surface to move around and come together.
这意味着它们确实依赖于潮湿的环,否则孢子将无法生长——它们所含的不同生殖细胞需要在植物表面覆盖一层薄薄的水才能四处移动并聚集在一起。