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Mackay's Brittle Fern
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Nephrodium tenue, Cystopteris fragilis var. mackayi, Polypodium tenue, Aspidium tenue
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Polypodiopsida
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Polypodiales
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Woodsiaceae
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E-Canada (New Brunswick, Nova Scotia, Ontario, Quebec), USA (Arkansas, Arizona, Connecticut, Delaware, Illinois, Indiana, Iowa, Kansas, Kentucky, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, Nebraska, Nevada, New Hampshire, New Jersey, New York, North Carolina, Ohio, Oklahoma, Pennsylvania, Rhode Island, Tennessee, Utah, Vermont, Virginia, West Virginia, Wisconsin)
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ja
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