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 |
 | Tropical fern hosts of rust fungi J H Faull (1947) Journal of the Arnold Arboretum 28: 309-319 |
 | ∑Miocene fossil woods from the Columbia basalts of Central Washington. J. Arnold Arb. 42: 165--203. U & E S Barghoorn Prakash (1961) Journal of the Arnold Arboretum 42: 165-203 |
 | Structure of Spores in Relation to Fern Phylogeny Warren H Wagner (1974) Annals of the Missouri Botanical Garden 61: 332-353 |
 | Studies in Neotropical Paleobotany. II. The Miocene Communities of Veracruz, Mexico Alan Graham (1976) Annals of the Missouri Botanical Garden 63: 787-842 |
 | Nomenclatural And Taxonomic Notes On The Pteridophytes Of Costa-Rica Panama And Colombia Part 1 D B Lellinger (1977) Proceedings of The Biological Society of Washington 89: 703-732 |
 | A biosystematic revision of Bommeria C H Haufler (1979) Journal of the Arnold Arboretum 60: 445-476 |