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Published in Bothalia, in 1999, in volume 29, issue 2, pages 293-304

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Published in Torreya, in 1928, in volume 28, issue 5, pages 99-100

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Published in Botanical Gazette, in 1916, in volume 61, issue 3, pages 256-257

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Published in Torreya, in 1926, in volume 26, issue 6, pages 105-110

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Published in The Wilson Bulletin, in 1903, in volume 15, issue 2, pages 49-59

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Published in Proceedings of The American Philosophical Society, in 1869, in volume 11, issue 81, pages 215-220

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Published in Proceedings of The American Philosophical Society, in 1879, in volume 18, issue 104, pages 324-326

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Published in Proceedings of The American Philosophical Society, in 1880, in volume 19, issue 107, pages 15

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Published in Proceedings of The American Philosophical Society, in 1873, in volume 13, issue 81, pages 501-502

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Published in Proceedings of The American Philosophical Society, in 1889, in volume 26, issue 130, pages 428-429

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Published in Victorian Naturalist, in 2006, in volume 123, issue 3, pages 146-156

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Published in Proceedings of The American Philosophical Society, in 1869, in volume 11, issue 81, pages 299-300

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Published in Proceedings of The American Philosophical Society, in 1887, in volume 24, issue 125, pages 111-112

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Published in Proceedings of The American Philosophical Society, in 1869, in volume 11, issue 81, pages 94-102

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Published in Proceedings of The American Philosophical Society, in 1878, in volume 17, issue 101, pages 339-341

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Published in Proceedings of The American Philosophical Society, in 1883, in volume 21, issue 114, pages 263-266

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Published in Proceedings of The American Philosophical Society, in 1869, in volume 11, issue 81, pages 498

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Published in Proceedings of The American Philosophical Society, in 1871, in volume 12, issue 81, pages 163-167

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Published in Proceedings of The American Philosophical Society, in 1885, in volume 22, issue 120, pages 424-428

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Published in Proceedings of The American Philosophical Society, in 1887, in volume 24, issue 126, pages 242-243

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Published in Proceedings of The American Philosophical Society, in 1892, in volume 30, issue 139, pages 269-270

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Published in Proceedings of The American Philosophical Society, in 1877, in volume 16, issue 99, pages 622-625

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Published in Proceedings of The American Philosophical Society, in 1887, in volume 24, issue 126, pages 436

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Published in Proceedings of The American Philosophical Society, in 1871, in volume 12, issue 81, pages 435-436

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Published in Proceedings of The American Philosophical Society, in 1877, in volume 16, issue 99, pages 590-596

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Published in Proceedings of The American Philosophical Society, in 1885, in volume 22, issue 118, pages 104-113

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Published in Proceedings of The American Philosophical Society, in 1868, in volume 10, issue 80, pages 541-542

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Published in Proceedings of The American Philosophical Society, in 1879, in volume 18, issue 103, pages 239-247

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Published in American Fern Journal, in 1985, in volume 75, pages 18

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Published in Proceedings of The American Philosophical Society, in 1885, in volume 22, issue 120, pages 227-240

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Published in Rhodora, in 1971, in volume 73, issue 796, pages 465-540

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Published in Rhodora, in 1971, in volume 73, issue 795, pages 370-443

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Published in Rhodora, in 1971, in volume 73, issue 794, pages 161-237

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Published in Rhodora, in 1971, in volume 73, issue 793, pages 72-159

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Published in Bothalia, in 1990, in volume 20, issue 2, pages 208

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Published in Madroño, in 1964, in volume 17, issue 5, pages 145-152

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Published in Tijdschrift Voor Entomologie, in 1948, in volume 89, pages 1-9

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Published in Palaeontology, in 1963, in volume 6, issue 3, pages 397-407

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Published in Moscosoa, in 1989, in volume 5, pages 276-291

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in 1859, pages 1-3

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Published in Proceedings of The American Philosophical Society, in 1863, in volume 9, issue 70, pages 443-449

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Published in Breviora, in 1983, in volume 473, pages 1-35

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Published in Novon, in 1998, in volume 8, pages 204-206

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