Rhizoplaca porteri is a species of crustose lichen in the family Lecanoraceae.
References
Further reading Kondratyuk, S. Y., et al. "Molecular phylogeny of placodioid lichen-forming fungi reveal a new genus, Sedelnikovaea." Mycotaxon 129.2 (2015): 269–282. Leavitt, Steven D., et al. "Fungal specificity and selectivity for algae play a major role in determining lichen partnerships across diverse ecogeographic regions in the lichen‐forming family Parmeliaceae (Ascomycota)." Molecular ecology 24.14 (2015): 3779–3797.