The Mycology herbarium (fungarium) at The Arctic University Museum of Norway (former Tromsø Museum) includes c. 39 300 objects.About 90% of the accessions originate from the Norwegian mainland, mostly from Finnmark, Troms and Nordland counties. The foreign collections are mainly from neighboring countries. One third of collections consists of Ascomycota and there is a significant collections of Pyrenomycetes from Norway and other Nordic countries. Particularly the collection of corticolous and lignicolous Pyrenomycetes on Salix is good, and includes both Sordariomycetes and Dothideomycetes. In addition, the family Xylariaeae is represented with many specimens, particularly within the genera Hypoxylon and Nemania. The type collection of Pyrenomycetes s. lat. consist of 28 specimens.