van den Boom, Pieter P. G. “Further New or Interesting Lichens and Lichenicolous Fungi from Madeira With Notes on the Genus Gyalidea in Macaronesia”. Folia Cryptogamica Estonica 52 (August 19, 2015): 73–79. Accessed April 25, 2024. https://ojs.utlib.ee/index.php/FCE/article/view/fce.2015.52.09.