Nipdraugmose Anastrophyllum joergensenii - en svært sjelden art tilhørende en eksklusiv gruppe oseaniske levermoser

Abstract

Anastrophyllum joergensenii was described in 1910 based on material collected at Endestadnipa in Flora, Sogn og Fjordane in Norway, by the Norwegian bryologist Eugene Jørgensen. This is, a century later, still a rare species which belongs to the floristic element recognized as «the mixed northern hepatic mat» or «the oceanic boreal montane element». In Europe, this element is mainly found in Scotland, Ireland, Faeroe Islands, and Norway. Globally it is also found in eastern Himalaya and the Hengduan Mountains of south-western China, and British Columbia and southern Alaska in western North America. For long, A. joergensenii was in Norway only known from a few locations at the type locality, Endestadnipa. However, in 2006, 2007 and 2015, several new occurrences were registered at Endestadnipa. In 2014, the species was found at a new locality by Langevatnet in Sørdalen, Bremanger, Sogn og Fjordane and several new occurrences were registered in the same area in 2015 and 2017. Today, the species is monitored trough the Norwegian Nature index project. Here we present new knowledge about A. joergensenii, particularly its ecology and distribution in Norway, based on experiences from the last 10–15 years. We also discuss possible explanations for the fragmented distribution globally and regionally. At last we discuss possible threats to the Norwegian populations and need for conservation.