Bailey, Christine; Larson, D. W. (1982). "Water Quality and pH Effects on Umbilicaria mammulata (Ach.) Tuck". The Bryologist. 85 (4): 431–437. doi:10.2307/3242913. JSTOR3242913.
jstor.org
Bailey, Christine; Larson, D. W. (1982). "Water Quality and pH Effects on Umbilicaria mammulata (Ach.) Tuck". The Bryologist. 85 (4): 431–437. doi:10.2307/3242913. JSTOR3242913.