We report the results of recently investigated collections from Everglades National Park and Biscayne National Park that have yielded several new additions to the North American lichen checklist, and Caloplaca lecanorae, a new lichenicolous lichen found on the thallus of Lecanora leprosa. Those species new to North America include Arthonia compensatula, A. ochrospila, Bacidina pallidocarnea, Byssoloma absconditum, Coenogonium isidiigerum, C. isidiosum, Enterographa pallidella, Lecanora hypocrocina, L. tropica, Monoblastia palmicola and Parmotrema wrightii. Both Lecanora species have been reported from Mexico, which is excluded from the aforementioned checklist.