Pykälä, J., Himelbrant, D. E., Kuznetsova, E. S., & Alexeeva, N. M. (2012). The lichen genera Thelidium and Verrucaria in the Leningrad Region (Russia). Folia Cryptogamica Estonica, 49, 45-57. Retrieved from https://ojs.utlib.ee/index.php/FCE/article/view/13615