1. Magnusson AH. New or interesting Swedish lichens XII. Bot Not. 1945:304–314.
2. Magnusson AH. Studies in the ferruginea-group of the genus Caloplaca. Göteborgs Kungl Vetenskaps- och Vitterhets-Samhälles Handlingar Sjätte Följden Ser B. 1944;3(1):1–71.
3. Clauzade G, Roux C. Likenoj de okcidenta Europo. Ilustrita determinlibro. Bull Soc Bot Centre-Ouest. 1985;7(n.s.):1–893.
4. Søchting U, Tønsberg T. Caloplaca xanthostigmoidea (Räs.) Zahlbr., a common lichen in cool regions of the Northern Hemisphere. Symb Bot Ups. 1997;32(1):247–253.
5. Gaya E, Navarro-Rosinés P, Llimona X, Hladun N, Lutzoni F. Phylogenetic reassessment of the Teloschistaceae (lichen-forming Ascomycota, Lecanoromycetes). Mycol Res. 2008;112(5):528–546. http://dx.doi.org/10.1016/j. mycres.2007.11.005
6. Vondrák J, Hrouzek P. Caloplaca soralifera, a new species from Europe. Graphis Scripta. 2006;18(1):6–15.
7. Arup U, Arneng E, Søchting U. Caloplaca fuscorufa – a misunderstood species in northern Europe. Lichenologist. 2007;39(5):409–414. http:// dx.doi.org/10.1017/S0024282907007098
8. Arup U, Åkelius E. A taxonomic revision of Caloplaca herbidella and C. furfuracea. Lichenologist. 2009;41(5):465–480. http://dx.doi.org/10.1017/ S0024282909008780
9. Fałtynowicz W. The lichens, lichenicolous and allied fungi of Poland – an annotated checklist. Cracow: W. Szafer Institute of Botany, Polish Academy of Sciences; 2003.
10. Wilk K, Flakus A. Four species of Caloplaca (Teloschistaceae, lichenized Ascomycota) new to Poland. Mycotaxon. 2006;96:61–71.
11. Wilk K, Śliwa L. Note on Caloplaca soralifera (Teloschistaceae, lichenized Ascomycetes) in Poland. Acta Soc Bot Pol. 2012;81(1):61–63. http://dx.doi. org/10.5586/asbp.2012.008
12. Wilk K. Calcicolous species of the genus Caloplaca in the Polish Western Carpathians. Polish Bot Stud. (in press)
13. Kossowska M. Epilithic lichens on serpentinite rocks in Poland. Polish Bot J. 2001;46(2):191–197.
14. Bungartz F. Morphology and anatomy of the fertile structures. In: Nash III TH, Ryan BD, Gries C, Bungartz F, editors. Lichen flora of the Greater Sonoran Desert Region. I. Lichens unlimited. Tempe AZ: Arizona State University; 2002. p. 24–35.
15. Ryan BD, Bungartz F, Nash III TH. Morphology and anatomy of the lichen thallus. In: Nash III TH, Ryan BD, Gries C, Bungartz F, editors. Lichen flora of the Greater Sonoran Desert Region. I. Lichens unlimited. Tempe AZ: Arizona State University; 2002. p. 8–23.
16. Meyer B. Proposal for a standardized nomenclature and characterization of insoluble lichen pigments. Lichenologist. 2000;32(6):571–583. http:// dx.doi.org/10.1006/lich.2000.0294
17. Wirth V. Die Flechten Baden-Württembergs. 2nd ed. Stuttgart: Ulmer; 1995. (vol 1).
18. Nimis PL. The lichens of Italy. An annotated catalogue. Turin: The Turin Museum of Natural History; 1993. (Monografie; vol 12).
19. Wetmore CM. The Caloplaca sideritis group in North and Central America. Bryologist. 1996;99(3):292. http://dx.doi.org/10.2307/3244301
20. Hafellner J, Obermayer W. Flechten und lichenicole Pilze im Gebeit der Stubalpe (Österreich: Steiermark und Kärnten). Mitt Naturwiss Ver Steiermark. 2007;136:5–59.
21. Roux C, Coste C, Bricaud O, Bauvet C, Masson D. Lichens et champignons lichénicoles du parc national des Cévennes (France). 5 – Vue d’ensemble et conclusion. Bull Soc Linn Provence. 2008;59:243–279.
22. Vondrák J, Guttová A, Mayrhofer H. A further contribution to the knowledge of lichen-forming and lichenicolous fungi in Crete. Herzogia. 2008;21:105–124.
23. Kanz B, Dürhammer O, Printzen C. Lichens and lichenicolous fungi of the Bavarian Forest. Preslia. 2005;77:355–403.
24. Arup U. Contributions to the knowledge of Caloplaca in the Nordic countries. Graphis Scripta. 2011;23:10–20.
25. Vondrák J, Etayo J. A contribution to the diversity of lichen-forming and lichenicolous fungi in the Spanish Pyrenees. Herzogia. 2007;20:189–198.
26. Fletcher A, Laundon JR. Caloplaca Th. Fr. (1860). In: Smith CW, Aptroot A, Coppins BJ, Fletcher A, Gilbert OL, James PW, et al., editors. The lichens of Great Britain and Ireland. London: British Lichen Society; 2009. p. 245–273.