1. H. Mayrhofer, A. Atanassova, S. O. Nikolova, et al. "Mycobiota." 10, "Additions to the lichenized and lichenicolous fungi in Bulgaria." 39 (2020)
2. L. Arcadia, "Lichen flora of Greece, including lichenicolous fungi, ver. 10." (2022)
3. A. Atanassova and H. Mayrhofer "Fungi of Bulgaria, vol. 9." "Physciaceae. Part 1. Foliose genera." (2012)
4. "Red data book of the Republic of Bulgaria, volume 3: natural habitats." (2015)
5. P. Cretzoiu, "Rev. Bryol. Lichenol." 9, "Zur Flechtenflora von Bulgarien." 176 (1937)