Klopper, R.R., and N.R. Crouch. “Recircumscription and Distribution of Elements of the ‘Ceterach cordatum’ Complex (Asplenium: Aspleniaceae) in Southern Africa”. African Biodiversity & Conservation 42, no. 1 (December 12, 2012). Accessed June 14, 2026. https://www.abcjournal.org/index.php/abc/article/view/256.