Published in American Fern Journal, in 1966, in volume 56, pages 113-119
Created: 2017-04-23, modified: 2017-04-23![](https://www.biodiversitylibrary.org/pagethumb/47856990,60,60)
Published in Madroño, in 1968, in volume 19, issue 5, pages 165-179
Created: 2016-02-15, modified: 2016-07-07
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