Published in American Fern Journal, in 1987, in volume 77, pages 28-32
Created: 2017-04-23, modified: 2017-04-23![](https://www.biodiversitylibrary.org/pagethumb/9304594,60,60)
Published in Sida, Contributions To Botany, in 1988, in volume 13, issue 1, pages 121
Created: 2015-12-02, modified: 2015-12-02![](https://www.biodiversitylibrary.org/pagethumb/1390092,60,60)
Published in Biol Bull, in 1933, in volume 64, pages 183-205
Created: 2010-01-06, modified: 2011-06-21