在细胞质存在一个疏松的微管束网络。
Microtubule bundles in the tetrad cell radiated from the nucleus.
茎微管束外具韧皮纤维束；
There were phloem fiber bundle of stem outside vascular bundles.
当小孢子发育至成熟期，细胞内的微管束变得纤细，而网络则变得紧密。
At the late stage of microspore formation, microtubule bundles became thinner and reticulately oriented to form a tightly knitted network.
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