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Academic article
  • 2020. New and noteworthy lichens and lichenicolous fungi from Norway. Graphis Scripta. 1-47.
  • 2020. Lichens and associated fungi from Glacier Bay National Park, Alaska. The Lichenologist. 61-181.
  • 2019. The Sticta fuliginosa group in Norway and Sweden. Graphis Scripta. 23-33.
  • 2019. Opegrapha halophila (Opegraphaceae), a new lichen species from coastal British Columbia, Canada, and Alaska, U.S.A. The Bryologist. 457-462.
  • 2019. Miriquidica majae, a new lichen species from oldgrowth Picea abies forests in central Norway. Graphis Scripta. 14-22.
  • 2019. Five new crustose Stereocaulon species in western North America. The Bryologist. 197-218.
  • 2019. Biatora alnetorum (Ramalinaceae, Lecanorales), a new lichen species from western North America. MycoKeys. 55-65.
  • 2018. Varicellaria lactea new to the U.S.A. from Alaska. Opuscula Philolichenum. 1-5.
  • 2018. Psoroma spinuliferum (Pannariaceae), a new corticolous lichen species from Alaska with two different types of cephalodia. The Bryologist. 166-173.
  • 2018. Loxospora cristinae found in Germany. Herzogia. 995-999.
  • 2018. Lecidella varangrica sp. nov. from the Varanger Peninsula, northernmost Norway. Graphis Scripta. 149-154.
  • 2018. Jamesiella scotica new to Fennoscandia. Graphis Scripta. 24-29.
  • 2018. Fuscidea lightfootii and F. pusilla (Fuscideaceae, Umbilicariomycetidae, Ascomycota), two similar but genetically distinct species. The Lichenologist. 425-438.
  • 2018. Considerations and consequences of allowing DNA sequence data as types of fungal taxa. IMA Fungus. 167-175.
  • 2018. Biodiversity and ecology of lichens of Katmai and Lake Clark National Parks and Preserves, Alaska. Mycosphere. 859-930.
  • 2018. Biatora troendelagica new to North America from Alaska, USA. Graphis Scripta. 161-165.
  • 2017. The taxonomy of the lichen Fuscidea cyathoides (Fuscideaceae, Umbilicario¬mycetidae, Ascomycota) in Europe. The Lichenologist. 547-560.
  • 2017. The lichen genus Rinodina (Physciaceae, Caliciales) in north-eastern Asia. The Lichenologist. 617-672.
  • 2017. Molecular evidence of Apatococcus, including A. fuscideae sp. nov., as photobiont in the genus Fuscidea. Protist. 425-438.
  • 2017. Molecular analyses uncover the phylogenetic placement of the lichenized hyphomycetous genus Cheiromycina. Mycologia. 588-600.
  • 2017. Lecanora stanislai, a new, sterile, usnic acid containing lichen species from Eurasia and North America. Phytotaxa. 201-211.
  • 2017. Cliostomum piceicola, a new lichen species from oldgrowth coniferous forests in Northern Europe. Herzogia. 427-430.
  • 2016. Thelocarpon superellum ny for Norge [Thelocarpon superellum new to Norway]. Blyttia : Norsk botanisk forenings tidsskrift. 172-174.
  • 2016. The cyanomorph of Ricasolia virens comb. nov. (Lobariaceae, lichenized Ascomycetes). Opuscula Philolichenum. 12-21.
  • 2016. Scytinium singulare, a new lichen species from coastal California. North American Fungi. 1-6.
  • 2016. Porpidia nadvornikiana new to Norway. Graphis Scripta. 36-39.
  • 2016. Phylogenetic data and chemical traits characterize a new species in the lichen genus Tephromela. Herzogia. 383-402.
  • 2016. Morphological, chemical and species delimitation analyses provide new taxonomic insights into two groups of Rinodina. The Lichenologist. 469-488.
  • 2016. Laven Fellhanera duplex ny for Norge og Fennoskandia. Blyttia : Norsk botanisk forenings tidsskrift. 269-270.
  • 2016. Jamesiella scotica new to North America from USA, Alaska. Folia Cryptogamica Estonica. 23-24.
  • 2016. Gyalideopsis pusilla (Gomphillaceae, lichenized Ascomycetes), a new species from southeastern North America. North American Fungi. 1-4.
  • 2016. Fjordkrinslav Hypotrachyna aff. taylorensis, en for Norge og Fennoskandia ny bladlav. Blyttia : Norsk botanisk forenings tidsskrift. 252-255.
  • 2016. Five new species of Biatora from four continents. Herzogia. 566-585.
  • 2016. Cliostomum spribillei (Ramalinaceae, lichenized Ascomycetes), a new species from Western North America. North American Fungi.
  • 2015. Liten eikelav Flavoparmelia soredians funnet ny for Norge i Stavanger. Blyttia : Norsk botanisk forenings tidsskrift. 161-166.
  • 2015. Hidden diversity in the morphologically variable script lichen (Graphis scripta) complex (Ascomycota, Ostropales, Graphidaceae). Organisms Diversity & Evolution. 447-458.
  • 2015. Biatora aureolepra from Austria, new to Central Europe. Graphis Scripta. 59-60.
  • 2014. Schaereria corticola from the Canary Islands, new to Africa. Graphis Scripta. 49-50.
  • 2014. Reassessing evolutionary relationships in the filamentous cyanolichen genus Spilonema (Peltigerales, Lecanoromycetes). The Lichenologist. 373-388.
  • 2014. Molecular systematics of the wood-inhabiting, lichen-forming genus Xylographa (Baeomycetales,Ostropomycetidae) with eight new species. Symbolae Botanicae Upsalienses. 1-87.
  • 2014. Lepraria brodoi (Stereocaulaceae, lichenized Ascomycetes), a new species from the temperate rainforests of western Canada and southeastern Alaska, U.S.A. Opuscula Philolichenum. 20-25.
  • 2014. A new corticolous species of Rinodina (Physciaceae) and two interesting range extensions for species collected from Katmai National Park, Alaska. The Bryologist. 253-258.
  • 2013. Xylographa soralifera (lichenized Ascomycetes) new to Switzerland. Meylania. 15-16.
  • 2013. Taxonomy of the genus Myrionora, with a second species from South America. The Lichenologist. 159-167.
  • 2013. New records of lichen species from western Mongolia. Folia Cryptogamica Estonica. 13-22.
  • 2013. Lichens and Lichenicolous Fungi of Yosemite National Park, California. North American Fungi. 1-47.
  • 2013. Lichen-forming and lichenicolous fungi new to Kazakhstan. Herzogia. 103-116.
  • 2012. Rinodina chrysidiata, a new species from far eastern Asia and the Appalachian Mountains of North America. The Lichenologist. 179-187.
  • 2012. Ramboldia subcinnabarina revisited. Graphis Scripta. 9-13.
  • 2012. New records, range extensions and nomenclatural innovations for lichens and lichenicolous fungi from Alaska, USA. Herzogia. 177-210.
  • 2012. Further contributions to the genus Rinodina (Physciaceae, Lecanoromycetidae): two species new to science and a new record for the Canadian High Arctic. Herzogia. 125-143.
  • 2012. Cladonia straminea, the correct name for C. metacorallifera. Graphis Scripta. 33-35.
  • 2012. Biatora kodiakensis confirmed from Europe. Graphis Scripta. 49-52.
  • 2012. Amandinea lignicola, a new species from the Pacific coast of North America. Graphis Scripta. 60-64.
  • 2011. Pertusaria mccroryae new to Europe. Graphis Scripta. 27-29.
  • 2011. Lecanora sorediomarginata, a new epiphytic lichen species discovered along the Portuguese coast. The Lichenologist. 99-111.
  • 2011. Convergent evolution of a symbiotic duet: The case of the lichen genus Polychidium (Peltigerales, Ascomycota). American Journal of Botany. 1647-1656.
  • 2011. Chrysothrix flavovirens, Lepraria elobata, and Ochrolechia arborea new to Portugal. Mycotaxon. 335-344.
  • 2010. The lichen Bryoria bicolor found fertile in western Norway. Graphis Scripta. 52-53.
  • 2010. Rinodina orculata and R. roboris new to Fennoscandia. Graphis Scripta. 43-46.
  • 2010. New data for Rinodina flavosoralifera. The Lichenologist. 693-696.
  • 2010. Lichens and lichenicolous fungi of the Klondike Gold Rush National Historic Park, Alaska, in a global biodiversity context. The Bryologist. 439-515.
  • 2010. Leptogium insigne, a new species from the Pacific Northwest of North America. Bibliotheca Lichenologica. 241-245.
  • 2010. Fuscopannaria cheiroloba, a rarely collected lichen species. Graphis Scripta. 1-2.
  • 2010. Buellia violaceofusca new to Norway. Graphis Scripta. 31-31.
  • 2009. Micarea stipitata and Myochroidea leprosula new to Fennoscandia. Graphis Scripta. 49-52.
  • 2009. Contributions to an epiphytic lichen flora of northwest North America: I. Eight new species from British Columbia inland rain forests. The Bryologist. 109-137.
  • 2008. Xylographa soralifera, a new species in the X. vitiligo complex. Graphis Scripta. 58-63.
  • 2008. Xylographa soralifera : a new species in the X. vitiligo complex. Graphis Scripta. 58-63.
  • 2008. Myochroidea, a new genus of corticolous, crustose lichens to accommodate the Lecidea leprosula group. The Lichenologist. 195-207.
  • 2008. Fuscidea lightfootii new to Fennoscandia. Graphis Scripta. 31-32.
  • 2007. The identity of Lecanora carpathica (Lecanoraceae) described from Slovakia. Mycotaxon. 247-250.
  • 2007. Notes on the Lichen Genus Lepraria in Great Smoky Mountains National Park, southeastern North America: Lepraria lanata and L. salazinica spp. nov. Opuscula Philolichenum. 51-53.
  • 2007. Mycoblastus marginatus, a new synonym for M. affinis (Mycoblastacea, Lichenized Ascomycota). Mycotaxon. 105-107.
  • 2007. Lepraria bergensis and L. obtusatica new to Germany. Herzogia. 327-328.
  • 2007. Hypogymnia incurvoides new to Scandinavia and the Appalachian Mountains. Graphis Scripta. 10-12.
  • 2007. Bacidia lobarica (Bacidiaceae, Lecanorales) sp nov., a sorediate lichen from the southeastern USA. The Bryologist. 487-489.
  • 2006. Psoroma paleaceum comb. nov. the only hairy Psoroma in northern Europe. Graphis Scripta. 54-57.
  • 2006. Pertusaria flavocorallina new to Norway. Graphis Scripta. 62-63.
  • 2006. Notes on the chemistry of Scandinavian Lobaria species. Graphis Scripta. 27-28.
  • 2006. Notes on some lichens from the Great Smoky Mountains National Park, North Carolina/Tennessee, U.S.A. Evansia. 61-63.
  • 2006. Notes on Botryolepraria lesdainii in North America. Evansia. 34-35.
  • 2006. Lepraria gelida, a new species from the Arctic. Graphis Scripta. 64-64.
  • 2006. Arthothelium norvegicum in North America. Evansia. 80-81.
  • 2006. A new species of Lepraria (Lecanorales : Stereocaulaceae) from the Canary Islands and the typification of Lepravia isidiata. The Lichenologist. 213-221.
  • 2005. On the chemistry of Ramalina thrausta. Graphis Scripta. 35-36.
  • 2005. Leptogium britannicum refound in Norway. Graphis Scripta. 39-40.
  • 2005. Leioderma cherokeense (Pannariaceae, Lecanorales) sp. nov. from the Great Smoky Mountains, North Carolina, U.S.A. The Bryologist. 412-414.
  • 2005. Lecidea roseotincta new to Asia. The Journal of Japanese Botany. 303-305.
  • 2004. Two new species of Dactylospora (Dactylosporaceae, Lecanorales), with a key to the known species in Scandinavia. The Bryologist. 357-362.
  • 2004. Two new species of Dactylospora (Dactylosporaceae, Lecanorales), with a key to the known species in Scandinavia. The Bryologist. 357-362.
  • 2004. The structure of friesiic acid. Graphis Scripta. 43-45.
  • 2004. Notes on the chemistry of some lichens, including four species of Lepraria. Graphis Scripta. 43-45.
  • 2004. New and interesting Biatora-species, mainly from North America. Symbolae Botanicae Upsalienses. 343-357.
  • 2004. Arthonia biatoricola sp. nov. from north-western Europe and northern Pacific North America. Symbolae Botanicae Upsalienses. 107-111.
  • 2004. Additions to the lichen flora of Great Smoky Mountains National Park. All Taxa Biodiversity Inventory. 6-6.
  • 2003. Phylogeography of Cavernularia hultenii: Evidence for slow genetic drift in a widely disjunct lichen. Molecular Ecology. 1473-1486.
  • 2002. Two new species in the lichen genus Szczawinskia A. Funk. The Lichenologist. 369-372.
  • 2002. Notes on the misunderstood Buellia dives (Th. Fr.) Th. Fr. The Lichenologist. 1-5.
  • 2002. Notes on the misunderstood Buellia dives (Th. Fr.) Th. Fr. The Lichenologist. s.1-5.
  • 2002. Most species of Lepraria and Leproloma form a monophyletic group closely related to Stereocaulon. Mycological Research. 1262-1276.
  • 2002. Biatora amaurospoda Anzi, a superfluous name for Lecidea pullata (Norman) Th. Fr. Graphis Scripta. 25-27.
  • 2000. Spilonemella, a new genus of cyanophilic lichens with species from North America and Japan (Coccocarpiaceae). The Bryologist. 108-116.
  • 2000. Pigmentation of Cladonia infected by the lichenicolous fungus Arthrorhaphis aeruginosa. The Lichenologist. 300-303.
  • 2000. Pigmentation of Cladonia infected by the lichenicolous fungus Arthrorhaphis aeruginosa. The Lichenologist. 300-303.
  • 1999. The lichen genus Biatora in northwestern North America. The Bryologist. 692-713.
  • 1999. Pseudocyphellaria arvidssonii new to Africa, and P. mallota new to North America. The Bryologist. 128-129.
  • 1999. Notes on the chemistry of some lichens from Norway. Graphis Scripta. 4-6.
  • 1999. Notes on small species of Leptogium from Pacific North America. The Bryologist. 412-417.
  • 1999. Notes on small Leptogium species from Pacific North America. The Bryologist. 412-417.
  • 1999. Lichens of an Old-Growth Forest in a Little Explored Area of Western Oregon, U.S.A. Evansia. 137-142.
  • 1999. Additions to the lichen flora of North America VIII. Santessoniella grisea new to North America. Evansia. 184.
  • 1999. Additions to the lichen flora of North America VII. Soem species found on Waadah Island, Washington. The Bryologist. 133-134.
  • 1998. Porina radicicola, a new lichen from western North America. The Lichenologist. 245-248.
  • 1998. Additions to the lichen flora of Norway and Sweden. Graphis Scripta. 27-31.
  • 1998. Additions to the lichen flora of North America VI. The Bryologist. 522-524.
  • 1997. The chemotypes of Cetrelia olivetorum in Norway. Graphis Scripta. 5-7.
  • 1997. On the alleged apothecia of Leproloma. The Lichenologist. 597-599.
  • 1997. Caloplaca xanthostigmoidea (R@æs.) Zahlbr., a common lichen in cool regions of the Northern Hemisphere. Symbolae Botanicae Upsalienses. 247-253.
  • 1996. The threatened macrolichens of Norway - 1995. Sommerfeltia. 1-258.
  • 1996. The lichenicolous genus Lettauia in North America. The Bryologist. 32-33.
  • 1996. The lichenicolous genus Lettauia in North America. The Bryologist. 32-33.
  • 1996. Boreal regnskog i Norge - habitatet for trøndelagselementets lavarter. Blyttia : Norsk botanisk forenings tidsskrift. 157-177.
  • 1996. Boreal regnskog i Norge - habitatet for trøndelagselementets lavarter. Blyttia : Norsk botanisk forenings tidsskrift. 157-177.
  • 1996. A new species of Megalaria from the North American west coast, and notes on the generic circumscription. The Bryologist. 34-40.
  • 1996. A new species of Megalaria from the Norht American West Coast, and Notes on the Generic Circumscription. The Bryologist. 34-40.
  • 1995. Rinodina stictica, a new corticolous, sorediate lichen species from the Pacific northwest of North America. The Bryologist. 41-44.
  • 1995. Cladonia peziziformis new to Norway from a burnt Calluna heath. Graphis Scripta. 11-12.
  • 1995. Cladonia incrassata new to Norway and the problem of C. anitae in Europe. Graphis Scripta. 61-65.
  • 1995. Additions to the lichen flora of North America V. Arthonia stellaris. Evansia. 66-67.
  • 1995. Additions to the lichen flora of North America IV. Scoliciosporum sarothamni. Evansia. 27-30.
  • 1995. 4-O-Methylcryptochlorophaeic acid found in Bacidia. Graphis Scripta. 39-41.
  • 1994. The lichen genus Solenopsora and the species S. vulturiensis new to Scandinavia. Graphis Scripta. 15-16.
  • 1994. The distribution of Cladonia borealis Stenroos in Norway. Graphis Scripta. 27-29.
  • 1994. The 10th meeting of the Nordic Lichen Society in Nord-Trøndelag, Norway, 1993. Graphis Scripta. 67-75.
  • 1994. Norske lavanavn, supplement. Blyttia : Norsk botanisk forenings tidsskrift. 25-28.
  • 1994. Leptogium cochleatum and Rinodina isidioides new to Scandinavia. Graphis Scripta. 85-88.
  • 1994. Chrysothrix flavovirens sp. nov. - the sorediate counterpart of C. chrysophthalma. Graphis Scripta. 31-33.
  • 1994. Arthrorhaphis aeruginosa and A. olivaceae, two new lichenicolous fungi. The Lichenologist. 295-299.
  • 1994. Additions to the lichen flora of North America III. Halecania viridescens and Opegrapha sorediifera. Evansia. 100-101.
  • 1994. A new species of Micarea with stalked pycnidia from the west coast of North America. Acta Botanica Fennica. 1-4.
  • 1993. Collema leptaleum new to Europe. Graphis Scripta. 22-23.
  • 1993. Cetraria inermis new to Europe. Graphis Scripta. 73-74.
  • 1993. Additions to the lichen flora of North America. The Bryologist. 629-630.
  • 1993. Additions to the lichen flora of North America. The Bryologist. 138-141.
  • 1992. The sorediate and isidiate, corticolous, crustose lichens in Norway. Sommerfeltia. 1-331.
  • 1992. Rinodina sheardii, a new lichen species from northwest Europe and northwest North America. The Bryologist. 216-217.
  • 1992. Huldrestry, Usnea longissima, en sjelden urskogslav på Vestlandet. Blyttia : Norsk botanisk forenings tidsskrift. 105-114.
  • 1992. Fellhanera new to Norway. Graphis Scripta. 118-119.
  • 1992. Fellhanera new to Norway. Graphis Scripta. 118-119.
  • 1992. Enterographa zonata and Opegrapha gyrocarpa, new to North America. The Bryologist. 225-226.
  • 1992. Cladonia norvegica new to North America. Evansia. 56-58.
  • 1992. Additions to the lichen flora of Svalbard. Graphis Scripta. 140-147.
Popular scientific lecture
  • 2008. Fra regnskog til ørken i det vestlige U.S.A.
  • 2007. Floraen i Great Smoky Mountains National Park, southern Appalachian Mountains, North Carolina og Tennessee.
Academic lecture
  • 2015. Lepraria.
  • 2015. Flavoparmelia soredians in Norway—a recently introduced lichen species?
  • 2014. Forestry, research debt and the decline of oldgrowth-dependent green (Dendrisco-)sticta(Lobariaceae) in British Columbia, Canada.
  • 2014. An evolutionary study of the Fuscideaceae (Lecanoromycetes, Ascomycota).
  • 2014. An evolutinary study of the Fuscideaceae (Lecanoromycetes, Ascomycota).
  • 2013. An evolutionary study of the Fuscideaceae (Umbilicariales).
  • 2002. Phylogeography of the widely disjunct lichen Cavernularia hultenii.
  • 2000. Lichens from the Pacific northwest of North America associated with a Mediterranean climate.
  • 2000. Lichens from the Pacific northwest of North America associated with a Mediterranean climate.
  • 1999. Lichen conservation in Norway, with emphasis on Norway's responsibilities to the European and global conservation effort.
Book review
  • 2008. Review of: Hinds, J.W. & Hinds, P.L. 2008. The macrolichens of of New England. Memoirs of The New York Botanical Garden: 96: 1-608. Graphis Scripta. 64-64.
  • 2008. Review of: Galloway, D.J. 2007. Flora of New Zealand Lichens. Revised second edition. Manaaki Whenua Press. ISBN: 978-0-478-09376-6. Graphis Scripta. 64-64.
Popular scientific article
  • 2015. Klimaendringer – spor i museets samlinger. Årbok for Universitetsmuseet i Bergen. 96-101.
  • 2012. Lav – vekster med flere ansikter. Årbok for Universitetsmuseet i Bergen. 83-91.
  • 2006. Publikasjonar Bergen Museum 2005. Vitenskaplege og populærvitskaplege artikklar. Årbok for Universitetsmuseet i Bergen. 74-79.
  • 2005. Notes on the lichen flora of the Great Smoky Mountains National Park. Southeastern Biology. 26-28.
  • 2005. Jetsetter oder Säulenheilige. Natur und Museum. 16-25.
  • 2003. Lepraria bergensis, en ny lav for vitenskapen fra Bergen. Glimt fra Lepraria-forskningen ved UiB. Årsbok for Bergen Museum. 41-43.
  • 2003. Lepraria + Stereocaulon = sant. Lavbulletinen. 12-16.
Feature article
  • 1992. (Bokanmeldelse av:) H. K@ymmerling, Zur Kenntnis der Flechtenflora am Hohen Mei@sner und in seinen Vorland (Hessen) unter besonderer Berucksichtigung chemischer Merkmale. (Bibliotheca Lichenologica 41). The Lichenologist. 201.
Doctoral dissertation
  • 2017. Taxonomy and phylogeny of the family Fuscideaceae (Umbilicariales, Ascomycota) with special emphasis on Fuscidea.
  • 1992. The sorediate and isidiate, corticolous, crustose lichens in Norway.
Academic chapter/article/Conference paper
  • 2011. Lavfloraen i Midt-Norges unike regnskoger. 5 pages.
  • 2010. Lav Lichenes. 13 pages.
  • 2010. Lav "Lichenes". 13 pages.
  • 2009. Ropalospora A. Massal. (1860). 2 pages.
  • 2009. Fuscidea V. Wirth & Vězda (1972). 5 pages.
  • 2008. Psilolechia. 2 pages.
  • 2008. Botryolepraria. 2 pages.
  • 2007. Sticta. 3 pages.
  • 2007. Pseudocyphellaria. 3 pages.
  • 2007. Lobariacea. 1 pages.
  • 2007. Lobaria. 6 pages.
  • 2006. Lav Lichenes. 11 pages.
  • 2006. Lav. 11 pages.
  • 2005. Havaas som lichenolog i nasjonal og internasjonal sammenheng. 9 pages.
  • 2004. Scoliciosporum. 2 pages.
  • 2004. Pyrrhospora. 4 pages.
  • 2004. Phlyctis. 2 pages.
  • 2004. Normandina. 2 pages.
  • 2004. Lepraria. 8 pages.
  • 2004. Japewia. 2 pages.
  • 2004. Gyalideopsis. 2 pages.
  • 2004. Chrysothrix. 2 pages.
  • 1992. Fuscidea. V. Wirth & V#vezda (1972). 6 pages.

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