An enclosing membrane， as that covering the sorus of a fern.
囊群盖一种包裹其它物的膜，如蕨类植物的孢囊群的覆盖膜
Each dot is called a sorus and consists of many sporangia mounted on stalks.
每个圆点称为一个囊群，由许多长在柄上得孢子囊组成。
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