Pärtel, K., K. Põldmaa, B. Kullman, A. Suija, P. Lõhmus, and MotiejūnaitėJ. “New Estonian Records. Helotiales, Ascomycota. Pezizales, Ascomycota. Lichens and Lichenicolous Fungi.”. Folia Cryptogamica Estonica, Vol. 44, 1, pp. 155-9, http://ojs.utlib.ee/index.php/FCE/article/view/13719.