Xerotrema megalospora - a remarkable ascomycete new to Scandinavia

Xerotrema megalospora is a rare ascomycete growing on wood of coniferous and deciduous trees. The spe¬cies was found new to Scandinavia on a decorticated snag of Picea abies in Trøndelag, Central Norway, in late autumn 2009. Elsewhere in Europe it has been recorded only from Scotland and Ireland. Outside Europe it is known only from western North America. Xerotrema megalospora fits into a biogeographical element known as the Trøndelag phytogeographic element.