Brackel, Wolfgang, and Peter Döbbeler. “An Addition to the Knowledge of Lichenicolous Fungi of Greece With a Key to the Lichenicolous Fungi on Collema s.L.”. Folia Cryptogamica Estonica 57 (October 7, 2020): 147-152. Accessed November 27, 2020. http://ojs.utlib.ee/index.php/FCE/article/view/fce.2020.57.13.