Perigrapha (fungus) explained

Perigrapha is a genus of fungi within the Arthoniales order that is parasitic on lichens.^[1] The genus has not been placed into a family.^[2]

Notes and References

1. http://www.ndsu.nodak.edu/instruct/esslinge/chcklst/chcklst7.htm Esslinger, T. L. 2009. A cumulative checklist for the lichen-forming, lichenicolous and allied fungi of the continental United States and Canada. North Dakota State University. First posted December 1 1997; most recent update 27 August, 2009. Fargo, North Dakota.
2. Lumbsch TH, Huhndorf SM. . December 2007 . Outline of Ascomycota  - 2007 . Myconet . 13 . 1–58 . The Field Museum, Department of Botany . Chicago, USA.