Abstract
Catenarina desolata, a species which was recently described from southernmost Chile is reported from the Antarctica for the first time. Although it was described as lichenicolous, in James Ross Island, many specimens belonging to this species have non lichenicolous habit. The dubious reports of Caloplaca aff. anchonphoenicon from James Ross Island actually belongs to Catenarina desolata. Collections were evaluated using morphological, anatomical and molecular characteristics (nrITS). The morphological and ecological variations of this species are discussed in this paper.
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