Three lecideoid lichens new to Svalbard, Norway

We report three lichen species, Lecidea apochroeella Nyl., Lecidea leucothallina Arnold, and Porpidia contraponenda (Arnold) Knoph & Hertel, as new additions to the Arctic flora of the Svalbard archipelago. Morphological and chemical descriptions are provided of these species based on the specimens collected from Svalbard, and we consider their global distribution.