1. Webbia;Metaxyaceae Pic. Serm.,1970
2. The pteridophytes of Suriname. An enumeration with keys of the ferns and fern-allies. Uitigaven Natuurwetschap. Stud. Suriname Nederl. Antillen, Natuurhist.;Kramer K. U.;Reeks,1978
3. Flora Mesoamericana 1. Psilotaceae a Salviniaceae;Riba R.,1995
4. Flora of the Venezuelan Guayana. 2: Pteridophytes, Spermatophytes: Acanthaceae-Araceae;Smith A. R.,1995
5. Ferns and Allied Plants, with Special Reference to Tropical America;Tryon R. M,1982