Fekroune Chaker, A. 2016. “Usnea Cornuta Körb. And Usnea Glabrescens (Vainio) Vainio Sens. Lat.: Species to Be Protected in the Peninsula of Edough (Algeria)”. Cellular and Molecular Biology 62 (6):69-73. https://mail.cellmolbiol.org/index.php/CMB/article/view/875.