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Thelypteris pilosa is a complex of species of fern known by the common names hairy maiden fern, softhairy maiden fern, and streak-sorus fern. Two loosely circumscribed varieties are native to Mexico and Central America (var. pilosa and var. major), and one species Thelypteris burksiorum Watkins and Farrar occurring in the United States. The fern has a disjunct distribution, with Thelypteris burksiorum Watkins and Farrar known from Winston County, Alabama, 2,000 kilometres (1,200 mi) from any other populations of this species. This plant is federally listed as a threatened species of the United States. There are two other varieties limited to Mexico and Central America, var. major and var. pilosa.
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