Crespo, Ana, Eva Barreno, Leopoldo G. Sancho, Ana Pintado, and H. Thorsten Lumbsch. “Four lichen species new to Spain”. Lazaroa, vol. 24, vol. 24, 2003, pp. 3-5, https://revistas.ucm.es/index.php/LAZA/article/view/LAZA0303110003A.