Martin, Ljudmilla, and Ave Suija. “New Estonian Records and Amendments: Lichenized Fungi; Lichenicolous Fungi”. Folia Cryptogamica Estonica 500 (1): 123-125. Accessed August 8, 2020. http://ojs.utlib.ee/index.php/FCE/article/view/fce.2013.50.16.