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Rhizoplaca ouimetensis is described new to science, growing on outcrops of diabase sills in the Lake Superior region of Ontario, Canada. It is the first known sorediate species of the genus, and a phylogenetic reconstruction based on the ITS and mtSSU markers place it in the R. chrysoleuca group. Morphologically, however, it resembles sorediate, yellow-green species of Lecanora with usnic acid, e.g., L. handelii and L. soralifera, but differs from those in forming larger, often pulvinate or minutely peltate areoles with a well-developed upper cortex and a medulla densely filled with calcium oxalate crystals. [ABSTRACT FROM AUTHOR]

As part of an ongoing, comprehensive inventory of all Galapagos lichen species, the genus Bulbothrix is revised here. In Galapagos it is represented by five species of which only one, B. laevigatula, had previously been reported. Bulbothrix lyngei, B. scortella and B. subdissecta are all new to Galapagos; they also represent the first reports of these species for Ecuador. A fifth species, Bulbothrix bulbillosa, is described as new to science. [ABSTRACT FROM AUTHOR]