The outer wall (extine) of the pollen grain is often diagnostic (see pollen) and very resistant to decay.
花粉(花粉
)通常为特异性的并很难
烂。
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That this is the origin of the caudicle, even when of considerable length and highly developed, we have good evidence in the aborted pollen-grains which can sometimes be detected embedded within the central and solid parts.
这就是叶柄的起源, 即使在叶柄相当长且高度发达的情况下,我们在花粉粒的败育中也有很好的证据, 有时可以检测到花粉粒嵌在中央和实心部分中。
Having found a female tree exactly sixty yards from a male tree, I put the stigmas of twenty flowers, taken from different branches, under the microscope, and on all, without exception, there were a few pollen-grains, and on some a profusion.
在距离一棵雄树正好 60 码处找到一棵雌树后, 我把从不同树枝上摘下的 20 朵花的柱头放在显微镜下,所有的花粉无一例外有一些花粉粒, 而在一些花粉粒上则是大量的.