Published in Journal of The Washington Academy of Sciences, in 1922, in volume 12, issue 20, pages 454-460
Created: 2015-03-16, modified: 2015-03-16![](https://www.biodiversitylibrary.org/pagethumb/32127828,60,60)
Published in Torreya, in 1903, in volume 3, issue 12, pages 184-185
Created: 2022-12-15, modified: 2022-12-15![](https://www.biodiversitylibrary.org/pagethumb/3332312,60,60)
Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 111-113
Created: 2011-07-31, modified: 2011-07-31![](https://www.biodiversitylibrary.org/pagethumb/39702335,60,60)
Published in Journal of The Washington Academy of Sciences, in 1924, in volume 14, issue 6, pages 139-145
Created: 2015-03-16, modified: 2015-03-16![](https://www.biodiversitylibrary.org/pagethumb/2265701,60,60)
Published in Proceedings of The Biological Society of Washington, in 1905, in volume 18, pages 231-232
Created: 2011-07-31, modified: 2011-07-31![](https://www.biodiversitylibrary.org/pagethumb/2348139,60,60)
Published in Proceedings of The Biological Society of Washington, in 1906, in volume 19, pages 23-24
Created: 2011-07-31, modified: 2011-07-31![](https://www.biodiversitylibrary.org/pagethumb/3335034,60,60)
Published in Proceedings of The Biological Society of Washington, in 1917, in volume 30, pages 179-184
Created: 2011-07-31, modified: 2021-04-05![](https://www.biodiversitylibrary.org/pagethumb/3335270,60,60)
Published in Proceedings of The Biological Society of Washington, in 1919, in volume 32, pages 111-112
Created: 2011-07-31, modified: 2021-04-05![](https://www.biodiversitylibrary.org/pagethumb/34510578,60,60)
Published in Proceedings of The Biological Society of Washington, in 1923, in volume 36, pages 49-50
Created: 2011-07-31, modified: 2011-07-31![](https://www.biodiversitylibrary.org/pagethumb/34552585,60,60)
Published in Proceedings of The Biological Society of Washington, in 1924, in volume 37, pages 63-64
Created: 2011-07-31, modified: 2011-07-31![](https://www.biodiversitylibrary.org/pagethumb/34560891,60,60)
Published in Proceedings of The Biological Society of Washington, in 1933, in volume 46, pages 157-158
Created: 2011-07-31, modified: 2011-07-31![](https://www.biodiversitylibrary.org/pagethumb/39702403,60,60)
Published in Journal of The Washington Academy of Sciences, in 1924, in volume 14, issue 9, pages 195-199
Created: 2015-03-16, modified: 2015-03-16![](https://www.biodiversitylibrary.org/pagethumb/2265675,60,60)
Published in Proceedings of The Biological Society of Washington, in 1905, in volume 18, pages 205-206
Created: 2011-07-31, modified: 2011-07-31![](https://www.biodiversitylibrary.org/pagethumb/2265685,60,60)
Published in Proceedings of The Biological Society of Washington, in 1905, in volume 18, pages 215-216
Created: 2011-07-31, modified: 2011-07-31![](https://www.biodiversitylibrary.org/pagethumb/34560893,60,60)
Published in Proceedings of The Biological Society of Washington, in 1933, in volume 46, pages 159-160
Created: 2011-07-31, modified: 2011-07-31![](https://www.biodiversitylibrary.org/pagethumb/39921008,60,60)
Published in Journal of The Washington Academy of Sciences, in 1928, in volume 18, pages 316-317
Created: 2015-03-16, modified: 2015-03-16![](https://www.biodiversitylibrary.org/pagethumb/3332036,60,60)
Published in Proceedings of The Biological Society of Washington, in 1918, in volume 31, pages 171-172
Created: 2011-07-31, modified: 2011-07-31![](https://www.biodiversitylibrary.org/pagethumb/30938450,60,60)
Published in American Fern Journal, in 1928, in volume 18, pages 94-95
Created: 2017-04-23, modified: 2017-04-23![](https://www.biodiversitylibrary.org/pagethumb/34552621,60,60)
Published in Proceedings of The Biological Society of Washington, in 1924, in volume 37, pages 97-104
Created: 2011-07-31, modified: 2011-07-31![](https://www.biodiversitylibrary.org/pagethumb/34563771,60,60)
Published in Proceedings of The Biological Society of Washington, in 1935, in volume 48, pages 115-117
Created: 2011-07-31, modified: 2011-07-31![](https://www.biodiversitylibrary.org/pagethumb/39918977,60,60)
Published in Journal of The Washington Academy of Sciences, in 1934, in volume 24, issue 12, pages 549-557
Created: 2015-03-16, modified: 2015-03-16![](https://www.biodiversitylibrary.org/pagethumb/569574,60,60)
Published in Rhodora, in 1918, in volume 20, issue 229, pages 19-20
Created: 2016-07-19, modified: 2016-07-19![](https://www.biodiversitylibrary.org/pagethumb/2308201,60,60)
Published in Proceedings of The Biological Society of Washington, in 1900, in volume 13, pages 199-200
Created: 2011-07-31, modified: 2011-07-31![](https://www.biodiversitylibrary.org/pagethumb/34551841,60,60)
Published in Proceedings of The Biological Society of Washington, in 1930, in volume 43, pages 167-178
Created: 2011-07-31, modified: 2011-07-31![](https://www.biodiversitylibrary.org/pagethumb/3335276,60,60)
Published in Proceedings of The Biological Society of Washington, in 1919, in volume 32, pages 125-126
Created: 2011-07-31, modified: 2021-04-05![](https://www.biodiversitylibrary.org/pagethumb/3333627,60,60)
Published in Proceedings of The Biological Society of Washington, in 1922, in volume 35, pages 47-51
Created: 2011-07-31, modified: 2021-04-05![](https://www.biodiversitylibrary.org/pagethumb/39689749,60,60)
Published in Journal of The Washington Academy of Sciences, in 1944, in volume 34, issue 2, pages 46-49
Created: 2015-03-16, modified: 2015-03-16![](https://www.biodiversitylibrary.org/pagethumb/30821897,60,60)
Published in American Fern Journal, in 1915, in volume 5, pages 1-4
Created: 2017-04-23, modified: 2017-04-23![](https://www.biodiversitylibrary.org/pagethumb/30816784,60,60)
Published in American Fern Journal, in 1917, in volume 7, pages 104-106
Created: 2017-04-23, modified: 2017-04-23![](https://www.biodiversitylibrary.org/pagethumb/30816924,60,60)
Published in American Fern Journal, in 1919, in volume 9, pages 1-5
Created: 2017-04-23, modified: 2017-04-23![](https://www.biodiversitylibrary.org/pagethumb/30817351,60,60)
Published in American Fern Journal, in 1919, in volume 9, pages 67-73
Created: 2017-04-23, modified: 2017-04-23![](https://www.biodiversitylibrary.org/pagethumb/31033874,60,60)
Published in American Fern Journal, in 1925, in volume 15, pages 16-19
Created: 2017-04-23, modified: 2017-04-23![](https://www.biodiversitylibrary.org/pagethumb/31033996,60,60)
Published in American Fern Journal, in 1925, in volume 15, pages 54-57
Created: 2017-04-23, modified: 2017-04-23![](https://www.biodiversitylibrary.org/pagethumb/30938335,60,60)
Published in American Fern Journal, in 1928, in volume 18, pages 1-6
Created: 2017-04-23, modified: 2017-04-23![](https://www.biodiversitylibrary.org/pagethumb/30938385,60,60)
Published in American Fern Journal, in 1928, in volume 18, pages 46-51
Created: 2017-04-23, modified: 2017-04-23![](https://www.biodiversitylibrary.org/pagethumb/32224144,60,60)
Published in American Fern Journal, in 1931, in volume 21, pages 136-139
Created: 2017-04-23, modified: 2017-04-23![](https://www.biodiversitylibrary.org/pagethumb/31880011,60,60)
Published in American Fern Journal, in 1962, in volume 52, pages 110
Created: 2017-04-23, modified: 2017-04-23![](https://www.biodiversitylibrary.org/pagethumb/30343748,60,60)
Published in Botanical Gazette, in 1905, in volume 39, issue 5, pages 366-369
Created: 2017-03-14, modified: 2017-03-14![](https://www.biodiversitylibrary.org/pagethumb/2265709,60,60)
Published in Proceedings of The Biological Society of Washington, in 1905, in volume 18, pages 239-240
Created: 2011-07-31, modified: 2011-07-31![](https://www.biodiversitylibrary.org/pagethumb/8443300,60,60)
Published in Journal of The Arnold Arboretum, in 1946, in volume 27, issue 4, pages 438-441
Created: 2016-07-07, modified: 2016-07-07![](https://www.biodiversitylibrary.org/pagethumb/30816786,60,60)
Published in American Fern Journal, in 1917, in volume 7, pages 106-109
Created: 2017-04-23, modified: 2017-04-23![](https://www.biodiversitylibrary.org/pagethumb/30816968,60,60)
Published in American Fern Journal, in 1919, in volume 9, pages 38-48
Created: 2017-04-23, modified: 2017-04-23![](https://www.biodiversitylibrary.org/pagethumb/3331992,60,60)
Published in Proceedings of The Biological Society of Washington, in 1918, in volume 31, pages 139-151
Created: 2011-07-31, modified: 2011-07-31![](https://www.biodiversitylibrary.org/pagethumb/34510440,60,60)
Published in Proceedings of The Biological Society of Washington, in 1937, in volume 50, pages 179-180
Created: 2011-07-31, modified: 2011-07-31![](https://www.biodiversitylibrary.org/pagethumb/30821900,60,60)
Published in American Fern Journal, in 1915, in volume 5, pages 4-7
Created: 2017-04-23, modified: 2017-04-23![](https://www.biodiversitylibrary.org/pagethumb/30454513,60,60)
Published in American Fern Journal, in 1913, in volume 3, pages 109-116
Created: 2017-04-23, modified: 2017-04-23![](https://www.biodiversitylibrary.org/pagethumb/30821948,60,60)
Published in American Fern Journal, in 1915, in volume 5, pages 50-52
Created: 2017-04-23, modified: 2017-04-23![](https://www.biodiversitylibrary.org/pagethumb/32411578,60,60)
Published in American Fern Journal, in 1946, in volume 36, issue 3, pages 91
Created: 2017-04-23, modified: 2017-04-23![](https://www.biodiversitylibrary.org/pagethumb/2339121,60,60)
Published in Proceedings of The Biological Society of Washington, in 1901, in volume 14, pages 161-163
Created: 2011-07-31, modified: 2011-07-31![](https://www.biodiversitylibrary.org/pagethumb/30089755,60,60)
Published in Botanical Gazette, in 1900, in volume 30, issue 6, pages 410-415
Created: 2017-03-14, modified: 2017-03-14