Gerald J. Gastony, David R. Rollo, Phylogeny and Generic Circumscriptions of Cheilanthoid Ferns (Pteridaceae: Cheilanthoideae) Inferred from rbcL Nucleotide Sequences, American Fern Journal, Vol. 85, No. 4, Use of Molecular Data in Evolutionary Studies of Pteridophytes (Oct. - Dec., 1995), pp. 341-360
No takes yet. Share an insight, caveat, or question.
Gastony et al. (1995) studied this question.