Stepanchikova, I. S., D. E. Himelbrant, M. Kukwa, and E. S. Kuznetsova. “New Records of Lichens and Allied Fungi from the Leningrad Region, Russia. II”. Folia Cryptogamica Estonica, vol. 48, Oct. 2011, pp. 85-94, https://ojs.utlib.ee/index.php/FCE/article/view/13637.