To cite package ‘ftolr’ in publications use:

Nitta J (2026). ftolr: Data for the Fern Tree of Life (FTOL). R package version 1.9.0, https://github.com/fernphy/ftolr.

Corresponding BibTeX entry:

  @Manual{,
    title = {ftolr: Data for the Fern Tree of Life (FTOL)},
    author = {Joel Nitta},
    year = {2026},
    note = {R package version 1.9.0},
    url = {https://github.com/fernphy/ftolr},
  }