There is no guarantee given by the authors that data provided in NPL are proof that the taxa are actually present in any park unit. The data indicate only that the taxa are present as determined by the original sources. This database contains only secondary source material, and not original presence/absence specimen data. Users are encouraged to contact the original references for specimen data.

There is also no guarantee that the species listed for these parks have been correctly identified. No specimens were examined for this purpose for the creation of the NPLichen database. Any information about published corrections to species identities would be most appreciated by the authors.

Finally, the data and the website that serves the data are not in any way officially connected with the National Park Service (NPS). The NPS does not support this database in any official manner.