To cite phylogram in publications use:

Wilkinson SP, Davy SK, Bunce M, Stat M (2018) Taxonomic identification of environmental DNA with informatic sequence classification trees. PeerJ Preprints 6:e26812v1.<doi:10.7287/peerj.preprints.26812v1>

Corresponding BibTeX entry:

  @Article{,
    title = {Taxonomic identification of environmental DNA with
      informatic sequence classification trees.},
    author = {Shaun P. Wilkinson and Michael Stat and Michael Bunce and
      Simon K. Davy},
    url = {https://peerj.com/preprints/26812},
    year = {2018},
    journal = {PeerJ Preprints},
    volume = {6},
    pages = {e26812v1},
    doi = {10.7287/peerj.preprints.26812v1},
  }