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灰背铁线蕨（学名：Adiantum myriosorum）为铁线蕨科铁线蕨属下的一个种。
Adiantum myriosorum is a fern species very similar to Adiantum pedatum. It was once included in that species but now is recognized as being genetically distinct. It is native to Asia, from central China to northern India.
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