BioStor
 | Ferns of the Republic of Salvador W R Maxon and P C Standley (1930) Proceedings of The Biological Society of Washington 43: 167-178 |
 | Augustus Fendler's Venezuelan Collections of Ferns and Fern Allies Alan R Smith and Carol A Todzia (1989) Annals of the Missouri Botanical Garden 76: 330-349 |