Mathiasen, Robert L., and Shawn C. Kenaley. “Arceuthobium Tsugense (Viscaceae): Four Subspecies With Contrasting Morphologies and Host Distributions”. Journal of the Botanical Research Institute of Texas 11, no. 2 (November 29, 2017): 363–390. Accessed May 4, 2024. https://journals.brit.org/jbrit/article/view/1076.