About 50 lichen species are in Scandinavia only known from Norway, many with the type as the only specimen. A few of these are truly rare or overlooked species, such as Bacidia verecundula, Caloplaca havaasii, Ionaspis granvina, Metamelanea caesiella, Micarea osloënsis, and the most remarkable of them all, Buellia tesserata, a widespread but rare, thermomediterranean species, which has not been recollected in Norway since its description. The majority, however, belong in critical, poorly understood genera, such as Lecidea, Polyblastia and Verrucaria and are probably only synonyms of more common species. They are in need of further studies, preferably on recently collected material, since many of them are only known from old, small, poorly developed specimens. In a few cases it has been possible to come to a definite identification with older names: Aspicilia alexandri and A. austronorvegica = Aspilidea myrinii, Bacidia luridoglaucella = Bacidina inundata, Lecidea atrocuprea = Tremolecia atrata, L. epiploica = Calvitimela perlata, Verrucaria osloënsis (syn. nov. Verrucaria magnussoniana) = Verrucaria macrostoma. All names are typified.
Two Lecidea species from the top of Galdhøpiggen mountain (2469 m), L. altissima and L. ludificans, both apparently distinct species closely related to Arctic taxa, are important additions to the arctic-alpine element and the only likely endemics among Norwegian lichens.
Stockholm: Nordisk Lichenologisk Förening , 2009. Vol. 21, no 1, 1-20 p.