Øvstedal, Dag O., and Niek J. M. Gremmen. “New Lichen Species from Tristan Da Cunha and Gough Island”. Folia Cryptogamica Estonica 470 (1): 43-49. Accessed November 27, 2020. https://ojs.utlib.ee/index.php/FCE/article/view/13650.