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Published in Torreya, in 1915, in volume 15, issue 6, pages 136-137

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Published in American Fern Journal, in 1962, in volume 52, pages 132-133

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Published in Botanical Gazette, in 1891, in volume 16, issue 12, pages 334-337

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Published in Phytologia, in 1979, in volume 44, pages 313-314

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