Lõhmus, P., L. Marmor, I. Jüriado, A. Suija, E. Oja, P. Degtjarenko, and T. Randlane. “Red List of Estonian Lichens: Revision in 2019”. Folia Cryptogamica Estonica, vol. 56, July 2019, pp. 63-76, doi:10.12697/fce.2019.56.07.