- Rai HS, Graham SW. 2010
- Utility of a large, multigene plastid data set in inferring higher-order relationships in ferns and relatives (monilophytes).
- Ranker TA, Haufler CH. 1990
- A new combination in Bommeria (Adiantaceae).
- Ranker TA, Haufler CH. 2008
- A new combination in Adenophorus (Polypodiaceae).
- Reid JD, Plunkett GM, Peters GA. 2006
- Phylogenetic relationships in the heterosporous fern genus Azolla (Azollaceae) based on DNA sequence data from three noncoding regions.
- Rothfels CJ, Larsson A, Kuo L-Y, Korall P, Chiou W-L, Pryer KM. 2012a.
- Overcoming deep roots, fast rates, and short internodes to resolve the ancient rapid radiation of eupolypod II ferns.
- Rothfels CJ, Li F-W, Sigel EM, Huiet L, Larsson A, Burge DO, Ruhsam M, Deyholos M, Soltis DE, Stewart Jr.CN, Shaw SW, Pokorny L, Chen T, dePamphilis C, DeGironimo L, , Chen L, Wei X, Sun X, Korall P, Stevenson DW, Graham SW, Wong GK-S, Pryer KM. 2015
- The evolutionary history of ferns inferred from 25 low-copy nuclear genes.
- Rothfels CJ, Schuettpelz E. 2014
- Accelerated rate of molecular evolution for vittarioid ferns is strong and not driven by selection.
- Rothfels CJ, Sundue MA, Kuo L-Y, Larsson A, Kato M, Schuettpelz E, Pryer KM. 2012b.
- A revised family-level classification for eupolypod II ferns (Polypodiidae: Polypodiales).
- Rothfels CJ, Windham MD, Grusz AL, Gastony GJ, Pryer KM. 2008
- Toward a monophyletic Notholaena (Pteridaceae): Resolving patterns of evolutionary convergence in xeric-adapted ferns.
- Rothfels CJ, Windham MD, Pryer KM. 2013
- A Plastid Phylogeny of the Cosmopolitan Fern Family Cystopteridaceae (Polypodiopsida).
- Rouhan G, Dubuisson JY, Rakotondrainibe F, Motley TJ, Mickel JT, Labat J-N, Moran RC. 2004
- Molecular phylogeny of the fern genus Elaphoglossum (Elaphoglossaceae) based on chloroplast non-coding DNA sequences: contributions of species from the Indian Ocean area.
- Rouhan G, Hanks JG, McClelland D, Moran RC. 2007
- Preliminary phylogenetic analysis of the fern genus Lomariopsis (Lomariopsidaceae).
- Rouhan G, Labiak PH, Randrianjohany E, Rakotondrainibe F. 2012
- Not so Neotropical after all: the grammitid fern genus Leucotrichum (Polypodiaceae) is also paleotropical, as revealed by a new species from Madagascar.
- Roux JP. 2001
- Conspectus of Southern African Pteridophyta
- Ruggiero MA, Gordon DP, Orrell TM, Bailly N, Bourgoin T, Brusca RC, Cavalier-Smith T, Guiry MD, Kirk PM. 2015
- A higher level classification of all living organisms.
- Rydin C, Wikström N. 2002
- Phylogeny of Isoëtes (Lycopsida): resolving basal relationships using rbcL sequences.