茎的初生维管束中有3大束和5～7小束，两个大维管束之间夹有2～3个小维管束，所有维管束在茎的横切面上呈环状排列；
There were 3 big vascular bundles and 5~7 small vascular bundles in young stem, and there were 2~3 small vascular bundles between two big vascular bundles, they were all arranged in circularity.
苔藓植物是植物界中的一大类群，其竞争力非常有限，常生长在维管束植物无法生存的环境中。
Bryophytes comprise is a big family of plant species. Because of their limited competition, bryophytes usually grow in hard habitats, where no vascular plants can live.
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