Abstract
A new species, Racomitrium patagonicum Bednarek-Ochyra & Ochyra, is described from southern South America. A herbarium name, R. senile Schimp. in A. Jaeger, is considered synonymous with R. patagonicum and confusion associated with its interpretation is explained. The new species belongs to the type subgenus of Racomitrium and is closely alied to R. lanuginosum (Hedw.) Brid. from which it differs by the very long and broadly decurrent, ruffled or wavy margins of the hyaline hair-point, broadly canaliculate leaves and dull green, strongly papillose laminal cells. Grimmia glacialis Müll. Hal., hom. illeg. (=Racomitrium glaciale Kindb.) from South Georgia is typified and this name is considered synonymous with Racomitrium lanuginosum subsp. lanuginosum. Distribution of the new species is mapped. A key to species of Racomitrium subg. Racomitrium is provided.
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