The last account of the lichen flora of Bermuda was published nearly 100 years ago by Riddle (1916) and repeated in Waterston (1947). The spectrum of species from that time was found to be quite accurate though limited in number. The increasing number of species noted here is predominantly a result of taxonomic progress as well as targeted, intensive exploration of poorly known Bermudian ecosystems. 105 species are recorded as new to Bermuda, and two new combinations are made. Bacidina varia Ekman is synonymized with B. brittoniana (Riddle) LaGreca & Ekman, and Lecidea calignosa Stirton is synonymized with Malmidea vinosa (Eschw.) Kalb, Rivas Platas & Lumbsch. A key to Caloplaca spp. occurring in Bermuda is provided. The first records of foliicolous lichens of Bermuda are given.

Dermatocarpon luridum is a subaquatic lichen that grows on siliceous rocks around the margins of freshwater lakes and rivers and is distributed throughout the temperate climatic zone, but co-occurring species have not been documented. The goal of this study was to investigate the variability of the species in the surrounding habitat within 1 m of the lichen. Sixty-three species of lichens were collected from the same habitat as D. luridum, and 34 of those species were growing directly on the rock substratum.