The checklists forming the framework of this enterprise and the taxonomy of the genera and species of macrolichens are from Esslinger, June 2010; higher categories are from Myconet.
This is very much a work in progress. The files for Peltigera, Pyxine, and Umbilicaria indicate the concept we are trying to implement, and the files for the remaining genera are beginning to move in that direction. According to the present representation, there are 146 genera and 1,474 species of macrolichens in North America. Approximately 73% of those genera and 27% of the species are illustrated on these pages by more than 1,450 photographs contributed by the Mushroom Observer community. A resolute lichenologist following all of these links would see something approaching 16,000 photos.
In passing, it's interesting to compare the figure of 146 genera of North American macrolichens with the total of 635 genera included in the current Cumulative Checklist for the Lichen-forming, Lichenicolous and Allied Fungi of the Continental United States and Canada.