Published in Madroño, in 1973, in volume 22, issue 1, pages 31

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Published in Phytologia, in 1971, in volume 21, issue 3, pages 165-195

Created: 2017-02-22, modified: 2017-02-22

Published in Rhodora, in 1941, in volume 43, issue 512, pages 344-348

Created: 2014-06-16, modified: 2016-07-26

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

Created: 2017-04-23, modified: 2017-04-23

Published in American Fern Journal, in 1970, in volume 60, pages 119-128

Created: 2017-04-23, modified: 2017-04-23

Published in Rhodora, in 1957, in volume 59, issue 698, pages 43-44

Created: 2016-07-19, modified: 2016-07-19

Published in American Fern Journal, in 1964, in volume 54, pages 71-73

Created: 2017-04-23, modified: 2017-04-23

Published in Phytologia, in 1971, in volume 22, pages 71-82

Created: 2011-01-26, modified: 2023-02-16

Published in Phytologia, in 1935, in volume 1, pages 145-150

Created: 2011-01-26, modified: 2023-02-16

Published in Phytologia, in 1935, in volume 1, pages 151-153

Created: 2011-01-26, modified: 2023-02-16

Published in Rhodora, in 1941, in volume 43, issue 510, pages 216-219

Created: 2014-06-16, modified: 2016-07-26

Published in Rhodora, in 1937, in volume 39, issue 458, pages 49-50

Created: 2016-07-19, modified: 2016-07-19

Published in American Fern Journal, in 1958, in volume 48, issue 4, pages 136

Created: 2017-04-23, modified: 2017-04-23

Published in American Fern Journal, in 1962, in volume 52, pages 148-150

Created: 2017-04-23, modified: 2017-04-23

Published in American Fern Journal, in 1966, in volume 56, pages 120-137

Created: 2017-04-23, modified: 2017-04-23

Published in American Fern Journal, in 1966, in volume 56, pages 177-179

Created: 2017-04-23, modified: 2017-04-23

Published in American Fern Journal, in 1970, in volume 60, pages 65-67

Created: 2017-04-23, modified: 2017-04-23

Published in American Fern Journal, in 1970, in volume 60, pages 103-106

Created: 2017-04-23, modified: 2017-04-23

Published in Phytologia, in 1971, in volume 22, pages 223-224

Created: 2011-01-26, modified: 2023-02-16

Published in Phytologia, in 1971, in volume 21, pages 56-62

Created: 2011-01-26, modified: 2011-06-21

Published in American Fern Journal, in 1964, in volume 54, pages 95-98

Created: 2017-04-23, modified: 2017-04-23

Published in American Fern Journal, in 1970, in volume 60, pages 28-29

Created: 2017-04-23, modified: 2017-04-23

Published in Torreya, in 1933, in volume 33, issue 3, pages 70-71

Created: 2022-12-14, modified: 2022-12-14

Published in Contributions in Science, in 1960, in volume 35, pages 1-7

Created: 2017-07-17, modified: 2023-02-16

Published in Annals of the Missouri Botanical Garden, in 1942, in volume 29, pages 35-58

Created: 2010-01-08, modified: 2015-12-16

Published in Rhodora, in 1966, in volume 68, issue 773, pages 93-94

Created: 2014-06-16, modified: 2016-07-26

Published in Rhodora, in 1969, in volume 71, issue 788, pages 580-581

Created: 2016-07-19, modified: 2016-07-19

Published in American Fern Journal, in 1956, in volume 46, issue 4, pages 152

Created: 2017-04-23, modified: 2017-04-23

Published in American Fern Journal, in 1966, in volume 56, pages 65-68

Created: 2017-04-23, modified: 2017-04-23

Published in American Fern Journal, in 1966, in volume 56, pages 188

Created: 2017-04-23, modified: 2017-04-23

Published in American Fern Journal, in 1968, in volume 58, pages 34-37

Created: 2017-04-23, modified: 2017-04-23

Published in American Fern Journal, in 1970, in volume 60, pages 39

Created: 2017-04-23, modified: 2017-04-23

Published in American Fern Journal, in 1970, in volume 60, pages 118-119

Created: 2017-04-23, modified: 2017-04-23

Published in Journal of the Arnold Arboretum, in 1936, in volume 17, pages 341-349

Created: 2011-01-26, modified: 2023-02-16

Published in Palaeontology, in 1971, in volume 14, issue 2, pages 262-265

Created: 2016-04-23, modified: 2016-04-23

Published in PHYTOLOGIA, in 1933, in volume 1, pages 19

Created: 2016-05-06, modified: 2016-05-06

Published in American Fern Journal, in 1946, in volume 36, issue 3, pages 91

Created: 2017-04-23, modified: 2017-04-23

Published in American Fern Journal, in 1956, in volume 46, pages 157-158

Created: 2017-04-23, modified: 2017-04-23

Published in American Fern Journal, in 1966, in volume 56, pages 79-81

Created: 2017-04-23, modified: 2017-04-23

Published in American Fern Journal, in 1970, in volume 60, pages 49-61

Created: 2017-04-23, modified: 2017-04-23

Published in American Fern Journal, in 1972, in volume 62, pages 57-64

Created: 2017-04-23, modified: 2017-04-23

Published in Proceedings of The Biological Society of Washington, in 1935, in volume 48, pages 73-76

Created: 2011-07-31, modified: 2011-07-31

Published in Proceedings of The Biological Society of Washington, in 1936, in volume 49, pages 153-154

Created: 2011-07-31, modified: 2011-07-31

Published in Proceedings of The Biological Society of Washington, in 1938, in volume 51, pages 75-77

Created: 2011-07-31, modified: 2011-07-31

Published in Proceedings of The Biological Society of Washington, in 1938, in volume 51, pages 215-216

Created: 2011-07-31, modified: 2011-07-31

Published in Proceedings of The Biological Society of Washington, in 1958, in volume 71, pages 153-154

Created: 2011-07-31, modified: 2011-07-31

Published in American Fern Journal, in 1950, in volume 40, pages 213-225

Created: 2017-04-23, modified: 2017-04-23

Published in American Fern Journal, in 1966, in volume 56, pages 184-185

Created: 2017-04-23, modified: 2017-04-23

Published in American Fern Journal, in 1968, in volume 58, pages 105-107

Created: 2017-04-23, modified: 2017-04-23

Published in American Fern Journal, in 1970, in volume 60, pages 7-12

Created: 2017-04-23, modified: 2017-04-23