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Published in American Fern Journal, in 1995, in volume 85, pages 64
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Published in Zoologica, in 1924, in volume 5, issue 14, pages 153-159
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Published in Asa Gray correspondence. Senders A, in 1886, pages 1-2
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Published in Madroño, in 1941, in volume 6, issue 3, pages 82-84
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Published in Proceedings of The United States National Museum, in 1891, in volume 14, pages 355-385
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Published in Proceedings of The United States National Museum, in 1908, in volume 35, pages 341-349
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Published in Jour Washington Acad Sci, in 1930, in volume 20, pages 1-3
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Published in Asa Gray correspondence. Senders A, in 1876, pages 1-2
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Published in Asa Gray correspondence. Senders A, in 1891, pages 1-2
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Published in Asa Gray correspondence. Senders A, in 1876, pages 1-2
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Published in Proceedings of The United States National Museum, in 1902, in volume 26, pages 75-77
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Published in Proceedings of The United States National Museum, in 1917, in volume 52, pages 385-391
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Published in Proceedings of The United States National Museum, in 1920, in volume 58, pages 381-384
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Published in Proceedings of The United States National Museum, in 1924, in volume 64, pages 1-5
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Published in Journal of the Washington Academy of Sciences, in 1933, in volume 23, issue 7, pages 360
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Published in Asa Gray correspondence. Senders A, in 1876, pages 1-2
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Published in Asa Gray correspondence. Senders Co-Cu, 1826-1891 (inclusive), in 1885, pages 1-2
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Published in Asa Gray correspondence. Senders Co-Cu, 1826-1891 (inclusive), in 1885, pages 1-2
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Published in Asa Gray correspondence. Senders Co-Cu, 1826-1891 (inclusive), in 1885, pages 1
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Published in Asa Gray correspondence. Senders Co-Cu, 1826-1891 (inclusive), in 1884, pages 1-2
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Published in Asa Gray correspondence. Senders Co-Cu, 1826-1891 (inclusive), in 1885, pages 1-3
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Published in Asa Gray correspondence. Senders Li-Ly, 1839-1891 (inclusive), in 1863, pages 1-2
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Published in Asa Gray correspondence. Senders Co-Cu, 1826-1891 (inclusive), in 1884, pages 1-2
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Published in Asa Gray correspondence. Senders Co-Cu, 1826-1891 (inclusive), in 1884, pages 1-2
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Published in Rhodora, in 1981, in volume 83, issue 835, pages 474
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Published in Rhodora, in 1983, in volume 85, issue 843, pages 396
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Published in Biol Bull, in 1957, in volume 112, pages 371-376
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Published in Proceedings of the United States National Museum, in 1914, in volume 47, pages 117-129
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Published in Biol Bull, in 1903, in volume 4, pages 66-95
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