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Academic article
  • 2019. The genus Massalongia (lichenised ascomycetae) in the Southern Hemisphere. MycoKeys. 125-140.
  • 2019. The Sticta fuliginosa group in Norway and Sweden. Graphis Scripta. 23-33.
  • 2019. Further additions to 'Rustici pauperrimi': a Linnean phrase for mosses. The Linnean. 9-10.
  • 2018. Trouble with botanical Latin? British Lichen Society Bulletin. 65-87.
  • 2018. 'Pauperrimi rustici', a Linnean myth about lichens, rectified. The Linnean. 9-12.
  • 2016. Scytinium singulare, a new lichen species from coastal California. North American Fungi. 1-6.
  • 2016. Rhododendron Leucaspis og noen av dens hybrider. Lapprosen. 4-6.
  • 2016. Leptogium insgne new to Ecuador, with a note on its generic position. Evansia. 14-17.
  • 2016. Gibbosporina, a new genus for foliose and tripartite, Palaeotropic Pannariaceae species previously assigned to Psoroma. The Lichenologist. 13-52.
  • 2016. Er "Arnulf" en grex? Lapprosen. 11-11.
  • 2016. Contrasting pattern of photobiont diversity in the Atlantic and Pacific populations of Erioderma pedicellatum (Pannariaceae). The Lichenologist. 275-291.
  • 2015. The gender of generic tree names. The Linnean. 8-9.
  • 2015. Rik høstblomstring hos duftende Rhododendron kjemper. Årringen. 25-32.
  • 2015. Pannaria reflectens, a misunderstood lichen of Australian mangroves, with a annotated key to the Australian species of the Pannaria lurida group. Australasian Lichenology. 13-15.
  • 2015. Notes on the Collema tenax complex with recognition of two further species in the genus Enchylium. Evansia. 43-47.
  • 2015. Additions to the cyanolichens of the Andes. Herzogia. 289-291.
  • 2015. 'Arnulf', uusi norjalainen aippiruusulajike pohjoisen puutarhoihin. Rhododendronlehti. 7-9.
  • 2014. Notes on the New Ex.9 in Art.9.8 of the ICN. Taxon. 132-133.
  • 2014. Extended phylogeny and a revised generic classification of the Pannariaceae (Peltigerales, Ascomycota). The Lichenologist. 627-656.
  • 2014. A revised generic classification of the jelly lichens, Collemataceae. Fungal diversity. 275-293.
  • 2014. A new species in the lichen genus Vahliella from the Canary Islands, including a key to Vahliellaceae, Pannariaceae, and Coccocarpiaceae in Macaronesia. Phytotaxa. 183-188.
  • 2013. What is Lichen oederi Gunnerus? Graphis Scripta. 16-17.
  • 2013. Validation of Anema tumidulum (Lichinaceae, lichenized Ascomycota), a widespread cyanophilic lichen. Herzogia. 1-7.
  • 2013. Tulipa norvegica, en ny norsk endemisk tulipanart? Blyttia : Norsk botanisk forenings tidsskrift. 44-59.
  • 2013. Proposal to conserve the generic name Leptogium (lichen Ascomycota) with a new type. Taxon. 1334.
  • 2013. Plantenavnene hos Gunnerus i Flora norvegica. Acta Academiae Regiae Gustavi Adolphi. 187-198.
  • 2013. Gunnerus om nytteplanter, eller 'Pan norvegicus'. Blyttia : Norsk botanisk forenings tidsskrift. 144-156.
  • 2013. Further contributions to the lichen genus Leptogium in southern South America. The Lichenologist. 787-789.
  • 2013. Epiphloea byssina, a new lichen for Norway. Graphis Scripta. 48-50.
  • 2012. Årets blomstring i rhododendronsamlingene på Milde. Lapprosen. 4-8.
  • 2012. Typification of the names published in Gunnerus’ Flora norvegica. Taxon. 1088-1095.
  • 2012. Notes on some pannariaceous lichens from New Caledonia. Cryptogamie Mycologie. 3-9.
  • 2012. Leptogium resupinans, a lichen to look out for in the British Isles. Bull. British Lichen Society Bulletin. 46-47.
  • 2012. Erfaringer fra artssamlingen av Rhododendron i Det norske arboret, Milde. II. subgenus Hymenanthes. Årringen. 4-118.
  • 2012. En ny norsk hinnelav, Leptogium aragonii. Blyttia : Norsk botanisk forenings tidsskrift. 33-35.
  • 2012. Distribution and status of Leptogium schraderi (Bernh.) Nyl. in Norway. Graphis Scripta. 6-8.
  • 2012. Collema paramense, a new lichen species with notes on the genus in the Andes. Bibliotheca Lichenologica. 135-140.
  • 2012. Bryoria rigida, a new Asian lichen species from the Himalayan region. The Lichenologist. 777-781.
  • 2012. Angivelser av karplanter som det er verdt å merke seg i J.E. Gunnerus' "Flora Norvegica" (1766-76). Blyttia : Norsk botanisk forenings tidsskrift. 90-98.
  • 2011. Vahliellaceae, a new familyy of cyanobacterial lichens (Peltigerales,Ascomycetes). The Lichenologist. 67-72.
  • 2011. Fantes klokkesøte Gentiana pneumonanthe engang i Gudbrandsdalen? Blyttia : Norsk botanisk forenings tidsskrift. 130-132.
  • 2011. Erfaringer fra artssamlingen av Rhododendron i Det norske arboret. Del I, subgenus Rhododendron. Årringen. 4-60.
  • 2010. Vahliellaceae, a new family of cyanobacterial lichens (Peltigerales, Ascomycetes). The Lichenologist. 67-72.
  • 2010. The state of botaniy in The British Isles about 1815 as reported by Christen Smith. The Linnean: newsletter and proceedings of the Linnean Soc of London. 42-53.
  • 2010. The lichen Bryoria bicolor found fertile in western Norway. Graphis Scripta. 52-53.
  • 2010. Sport for children and youth in the Scandinavian countries. Sport in Society. 625-642.
  • 2010. Parmeliella borbonica, a new lichen species from Reunion. The Lichenologist. 697-700.
  • 2010. New discoveries in the lichen genus Staurolemma Korber. Nova Hedwigia: Zeitschrift für Kryptogamenkunde. 153-159.
  • 2010. Narreglye Staurolemma omphalarioides, en av Norges merkeligste lavarter. Blyttia : Norsk botanisk forenings tidsskrift. 81-89.
  • 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. Catapyrenium psoromoides, new to Norway. Graphis Scripta. 9-13.
  • 2010. Biskop Gunnerus som botaniker. Blyttia : Norsk botanisk forenings tidsskrift. 53-60.
  • 2010. Additions to the lichen family Pannariaceae in Ecuador. Nordic Journal of Botany. 623-628.
  • 2010. A new hairy Leptogium from Nepal. The Lichenologist. 387-389.
  • 2009. The lichen Erioderma mollissimum (Sampaio) DuRietz found with certainty in Newfoundland, Canada. The Bryologist. 572-575.
  • 2009. Slippery when wet: phylogeny and character evolution in the gelatinous cyanobacterial lichens (Peltigerales, Ascomycetes). Molecular Phylogenetics and Evolution. 862-871.
  • 2009. Proposal to reject the name Lecidea epiploica. Taxon. 1003-1004.
  • 2009. Proposal to conserve the name Lichen lichenoides (Leptogium lichenoides) against Lichen tremelloides and L. tremella (lichenized Ascomycota). Taxon. 1002-1003.
  • 2009. Notes on the lichen genus Erioderma in Reunion. Cryptogamie Mycologie. 263-268.
  • 2009. Notes on the lichen gentis Erioderma in La Reunion. Cryptogamie Mycologie. 263-268.
  • 2009. Noen mykologiske observasjoner fra Njåskogen, Rogaland. Agarica. 74-78.
  • 2009. Lichens in Scandinavia known mainly from Norwegian type-specimens. Graphis Scripta. 1-20.
  • 2009. Knut Fægri in a historical perspective on his hundreth birthday. Blyttia : Norsk botanisk forenings tidsskrift. 15-22.
  • 2009. Godtfred Bohr og hans mulige funn av trådbregne i Bergensregionen. Bergens Museums Årbok. 78-84.
  • 2009. Erioderma mollissimum (Pannariaceae) found with certainty in Newfoundland, Canada. The Bryologist. 572-575.
  • 2009. A new, Asian species in the Parmeliella mariana complex (Pannariaceae). The Lichenologist. 257-259.
  • 2009. A new Asian speicies in the Parmeliella mariana group. The Lichenologist. 257-259.
  • 2008. Vahliella, a new lichen genus. The Lichenologist. 221-225.
  • 2008. Proposals to reject the name Verrucaria thelostoma and its synonym Pyrenula umbonata (lichenized ascomycota). Taxon. 990-991.
  • 2008. Proposal to conserve Aspicilia aquatica against Lichen mazarinus (Ascomycota: Pertusariales: Megasporaceae). Taxon. 989-989.
  • 2008. Leptogium loriforme P. M. Jorg. & Kashiw., a new hairy species from Papua New Guinea. The Lichenologist. 123-125.
  • 2007. The importance of bishop Gunnerus for Linnaeus. Botanical journal of the Linnean Society. 35-40.
  • 2007. The history of lichenology in Norway. Bibliotheca Lichenologica. 41-61.
  • 2007. Santessoniella saximontana, a new lichen species from British Columbia. Bibliotheca Lichenologica. 287-297.
  • 2007. New discoveries in Asian pannariaceous lichens. The Lichenologist. 235-243 .
  • 2007. Massalongiaceae fam. nov., an overlooked monophyletic group among the cyanobacterial lichens (Peltigerales, Lecanoromycetes, Ascomycota). The Lichenologist. 61-67.
  • 2007. Further notes on Asian pannariaceous lichens. The Lichenologist. 235-243.
  • 2006. The lichen family Pannariaceae in the montane regions of New Guinea. Journal of the Hattori Botanical Laboratory. 695-720.
  • 2006. Proposal to conserve the name Hygrophorus hudsonianus agains Endocarpon viride and Normandina davidis (lichenized Basidiomycota). Taxon. 1036-1037.
  • 2006. Pannaria conoplea and P-tavaresii (Ascomycota : Pannariaceae) new to Chile. The Lichenologist. 83-87.
  • 2006. Leptochidium crenatulum, a misunderstood arctic-alpine lichen species. Graphis Scripta. 19-22.
  • 2006. Fuscopannaria atlantica discovered in Scandinavia. Graphis Scripta. 16-18.
  • 2005. Notes on two subantarctic pannariaceous lichens. Cryptogamie Mycologie. 37-43.
  • 2005. Niels Gregerts Ingvald Wulfsverg (1847-1888) - en norsk mosepionér. Blyttia : Norsk botanisk forenings tidsskrift. 27-31.
  • 2005. Leioderma cherokeense (Pannariaceae, Lecanorales) sp. nov. from the Great Smoky Mountains, North Carolina, U.S.A. The Bryologist. 412-414.
  • 2005. A new Atlantic species in Fuscopannaria, with a key to its European species. The Lichenologist. 221-225.
  • 2004. The nomenclature of Umbilicaria havaasii. Graphis Scripta. 16-19.
  • 2004. The lichen family Pannariaceae in Ecuador. Symbolae Botanicae Upsalienses. 113-132.
  • 2004. The first yellow Pannaria. Nova Hedwigia: Zeitschrift für Kryptogamenkunde.
  • 2004. Revision of the Pannaria rubiginosa complex in South America. Nova Hedwigia: Zeitschrift für Kryptogamenkunde. 311-324.
  • 2004. Psoroma tenue var. boreale, an overlooked, widespread, artic-alpine lichen. Graphis Scripta. 60-64.
  • 2004. Proposals to add examples to two articles of the Code concerning valid publication. Taxon. 856.
  • 2004. Proposal to reject Homodium pernigratum Nyl. Taxon. 357.
  • 2004. Nomenclatural notes on Biatoridium Körb. (lichenized ascomycetes). Taxon. 521-522.
  • 2004. More, new Asian species in the lichen genus Fuscopannaria. The Lichenologist. 207-212.
  • 2004. Further contributions to the Pannariaceae (licheized Ascomycetes) of the Southern Hemisphere. Bibliotheca Lichenologica. 229-253.
  • 2004. En merkelig hvitveis med grønnprikkete blomster. Blyttia : Norsk botanisk forenings tidsskrift. 67.
  • 2004. Additional lichen records from Australia 23: Kroswia crystallifera P.M Jørg. and Pannaria molkenboeri. Australasian Lichenology. 25.
  • 2004. A revision of the Pannaria rubiginosa complex in South America. Nova Hedwigia: Zeitschrift für Kryptogamenkunde. 311-327.
  • 2004. A new north American species of the lichen genus Staurolemma (Collemataceae). The Bryologist. 392-394.
  • 2003. Studies in the lichen family Pannariaceae XI. The isidiate species of the genus Pannaria. Nova Hedwigia, Beiheft. 245-255.
  • 2003. Riverine Inputs of Organic Carbon and Nitrogen to Norwegian Coastal Areas. Ambio. 412-417.
  • 2003. Psoroma hirsutulum, a lichen found in Iceland, new to the Northern Hemisphere. Graphis Scripta. 55-57.
  • 2003. Notes on some misunderstood, subtropical Parmeliella species. Bryologist. 121-129.
  • 2003. Notes on African Pannariaceae (lichenized ascomycetes). The Lichenologist. 11-20.
  • 2003. Ladning på naturlig organisk materiale. Vann. 10-16.
  • 2003. Etableringen av botanikken ved vårt første universitet. Blyttia : Norsk botanisk forenings tidsskrift. 14-20.
  • 2003. Conspectus familiae Pannariaceae (Ascomycetes lichenosae). Ilicifolia. 4-81.
  • 2003. A new species of Arctomia from Sichuan province, China. The Lichenologist. 287-289.
  • 2002. Two species of Pannariaceae (lichenised ascomycetes) from New Zealand with a wider Southern Hemisphere distribution. New Zealand Journal of Botany. 327-329.
  • 2002. Two nomenclatural systems? Taxon. 737.
  • 2002. Two new, remarkable, arctic species in the lichen genus Fuscopannaria (Pannariaceae, lichenized ascomycetes). Brylogist. 465-469.
  • 2002. Towards a molecular phylogeny for the lichen family Pannariaceae (Lecanorales, Ascomycota). Canadian Journal of Botany. 625-634.
  • 2002. The lichen genus Erioderma in Southeast Asia. Annales Botanici Fennici. 201-211.
  • 2002. The lichen genus Erioderma (Pannariaceae) in Ecuador and neighbouring countries. Nordic Journal of Botany. 87-114.
  • 2002. The lichen Physma hondoanum Asah. discovered in Taiwan. The Lichenologist. 441-442.
  • 2002. Proposals to reject the name Collema proboscidale and to conserve the name Collema phyllocarpum with a conserved type, thereby stabilizing the nomenclature of some tropical Leptogium species (Collemataceae, Lecanorales). Taxon. 567-568.
  • 2002. Leptogium in. Lichen flora of the Greater Sonoran Desert Region. 320-340.
  • 2002. Kroswia, a new genus in the Pannariaceae (lichenised ascomycetes). The Lichenologist. 297-303.
  • 2002. Further notes on Asian species of the lichen genus. Journal of Hattori Botanical Laboratory. 225-229.
  • 2002. Biatora amaurospoda Anzi, a superfluous name for Lecidea pullata (Norman) Th. Fr. Graphis Scripta. 25-27.
  • 2002. A new species in the lichen genus Fuscoderma from New Guinea. The Lichenologist. 33-35.
  • 2001. The lichen genus Erioderma (Pannariaceae) in China and Japan. Annales Botanici Fennici. 259-264.
  • 2001. Notes on the Lichen Genus Parmeliella in Japan. Journal of Japanese Botany. 288-296.
  • 2001. A new Erioderma taxon from the Azores. The Lichenologist. 483-485.
  • 2000. Three new species in the lichen genus Degelia. The Lichenologist. 255-262.
  • 2000. The sorediate counterparts of the lichen Fuscopannaria leucosticta (Tuck.) P.M. Jørg. Bryologist. 104-107.
  • 2000. Studies in the Pannariaceae IX. A revision of Pannaria subg. Chryopannaria. Nova Hedwigia, Beiheft. 405-414.
  • 2000. Proposal to reject the name Hueella (Pannariaceae, lichenised Ascomycota). Taxon. 812.
  • 2000. Porina isidiata Kalb. & Hafellner, new to the British Isles. Bulletin of the British Lichen Society. 40-41.
  • 2000. On the identity of Ocellularia atlantica Erichs. Graphis Scripta. 1-2.
  • 2000. Notes on some East- Asian species of the lichen genus Fuscopannaria. Journal of the Hattori Botanical Laboratory. 247-259.
  • 2000. New or interesting Parmeliella species from Andes and Central America. The Lichenologist. 139-147.
  • 2000. Names are defined, but not as taxa. Taxon. 779.
  • 2000. Moelleropsis nebulosa ssp. frullaniae, a new lichen for Europe. Cryptogamie Mycologie. 49-52.
  • 2000. Mineralogical and Rb-Sr isotope studies of low-temperature diagenesis of Lower Cambrian clays of the Baltic paleobasin of North Estonia. ?. 95-105.
  • 2000. Die Flechte Santessoniella arctophila (Th. Fr.) Henssen, neu für die Alpen. Meylania. 14.
  • 2000. A bluegreen Psoroma hypnorum found in Trøndelag, Central Norway. Graphis Scripta. S.49-52..
  • 2000. A bluegreen Psoroma hypnorum found in Trøndelag, Central Norway. Graphis Scripta. S.49-52..
  • 2000. A blue-green Psoroma hypnorum found in Trøndelag, Central Norway. Graphis Scripta. 49-52.
  • 1999. The shaping of early lichenology: Linnaeus and his pupils. Symbolae Botanicae Upsalienses. 11-21.
  • 1999. The shaping of early lichenology: Linnaeus and his pupils. Symbolae Botanicae Upsalienses. 11-21.
  • 1999. Studies in the lichen family Pannariaceae VIII. Seven new parmelielloid lichens from New Zealand. New Zealand Journal of Botany. 257-268.
  • 1999. Skandinavisk utprøving av laboratorieutstyr for primærhelsetjenesten. Etablering av SKUP og igangsetting av de første evalueringene. Klinisk Biokemi i Norden. 56-60.
  • 1999. On Psoroma species from the southern Hemisphere with ceplalodia producing vegetative dispersal units. The Lichenologist. 341-347.
  • 1999. On Psoroma species from the Southern Hemisphere with cephalodia producing vegetative dispersal units. The Lichenologist. 341-347.
  • 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. Martin Vahl (1749-1804), den første norske botanikkprofessor. Blyttia : Norsk botanisk forenings tidsskrift. 53-60.
  • 1999. Low-temperature diagenetic illite-smectite in Lower Cambrian clays in North Estonia. Clay minerals. 151-164.
  • 1999. Further species of the lichen genus Staurolemma (Collemataceae, Lichenized ascomycetes). Brylogist. 20-25.
  • 1999. Further species of the lichen genus Staurolemma (Collemataceae, Lichenized Ascomycetes). The Bryologist. 20-25.
  • 1999. Diagenetic transformation of clay minerals in lower Cambrian argillaceous sediments of North Estonia. ?. 15-34.
  • 1998. What shall we do with the blue-green counterparts? The Lichenologist. 351-356.
  • 1998. Two proposals concerning recognition of living types. Taxon. 953-954.
  • 1998. Two proposals concerning Art. 59.5. Taxon. 956-956.
  • 1998. Two aquatic cyanolichens new to the Azores. The Lichenologist. 593-595.
  • 1998. Studies in the lichen family Pannariaceae VII. On some poorly known parmelielloid species from the Southern Hemisphere. The Lichenologist. 531-541.
  • 1998. Observations on the lichen genus Lempholemma Körb. in Australia. Muelleria. 45-50.
  • 1998. Observations on the lichen genus Lempholemma Körb. in Australia. Muelleria. 45-50.
  • 1998. Botanical Latin, quo vadis? Taxon. 431-433.
  • 1998. Acantholichen pannarioides, a new Basidiolichen from South America. The Bryologist. 444-447.
  • 1998. A new species in the lichen genus Lempholemma from the Baltic islands. Graphis Scripta. 5-6.
  • 1998. A new species in the lichen genus Lempholemma from the Baltic Islands. Graphis Scripta. 5-6.
  • 1997. On the alleged apothecia of Leproloma. The Lichenologist. 597-599.
  • 1997. Lichen phototypes, Nature's unmanageable misprints? Taxon. 721-722.
  • 1997. Further notes on hairy Leptogium species. Symbolae Botanicae Upsalienses. 113-130.
  • 1996. On the nomenclature of lichen phototypes. Taxon. 663-664.
  • 1996. On the nomenclature of lichen phototypes. Taxon. 663-664.
  • 1995. Ussurisennep, en ny norsk adventivplante. Blyttia : Norsk botanisk forenings tidsskrift. 11-14.
  • 1995. The lichen genus Leptogium (Collemataceae) in southern Chile, South America. Contr Hon G Follmann. 227-247.
  • 1995. Development of thallus and ascocaps in Stereocaulon tornensis. Contr Hon G Follmann. 181-190.
  • 1995. Damsgård garden, the plants used in a restored and reconstructed baroque garden from 1780. PACT (Strasbourg). 151-154.
  • 1994. The lichen genus Leioderma in Japan. Japanese journal of botany. s 383-386.
  • 1994. Studies in the lichen family Pannariaceae VI: The taxonomy and phytogeography of Pannaria Del. s lat. Journal Hattori Botanical Lab.. s 197-206.
  • 1994. Proposals to reject four species names of lichenized fungi. Taxon. s 462-464.
  • 1994. Ochrolechia szatala#"ensis Vers., new to Great Britain and Ireland. The Lichenologist. 394-397.
  • 1994. Norske lavnavn - supplement. Blyttia : Norsk botanisk forenings tidsskrift. 25-28.
  • 1994. Norske lavanavn, supplement. Blyttia : Norsk botanisk forenings tidsskrift. 25-28.
  • 1994. Mer om hvitbladet breiflangre. Blyttia : Norsk botanisk forenings tidsskrift. 15-16.
  • 1994. Leptogium palustre, a new lichen from East Africa. The Lichenologist. 213-216.
  • 1994. Further notes on European taxa of the lichen genus Leptogium, with emphasis on the small species. The Lichenologist. 1-29.
  • 1994. Discussion 5. Gyalectales, Lichinales, Peltigerales and Pertusariales. NATO Advances Study Institute series. Series A, Life sciences. s 389-392.
  • 1993. Pyrenopsis, Spilonema. The lichen flora of Great Britain and Ireland. 519-520, 570-.
  • 1993. Pseudohepatica, a remarkable new lichen genus from Venezuela. The Bryologist. 435-438.
  • 1993. Physma omphalarioides - its taxonomic position and phytogenography. Graphis Scripta. 12-17.
  • 1993. Nine proposals to conserve generic names of lichenized fungi. Taxon. 881-887.
  • 1993. Lempholemma, Psorotichia. The lichen flora of Great Britain and Ireland. 341-344, 512-.
  • 1993. Euopsis. The lichen flora of Great Britain and Ireland. 246-247.
  • 1993. En rar orkid#/e uten klorofyll. Blyttia : Norsk botanisk forenings tidsskrift. 15-16.
  • 1992. Pannariaceae. Flora og Australia. 246-293, 307-311.
  • 1992. Notes on Candelaria crawfordii. The Lichenologist. 407-410.
  • 1992. Notes on Candelaria crawfordii. The Lichenologist. 407-410.
  • 1992. More on a giant hodgenweeds. B.S.B.I. Newsletters. 17-18.
  • 1992. Forvillete krypende mjølker i Norge. Blyttia : Norsk botanisk forenings tidsskrift. 21-22.
  • 1992. Forvillete krypende mjølker i Norge. Blyttia : Norsk botanisk forenings tidsskrift. 21-22.
Academic anthology/Conference proceedings
  • 2007. Vegetasjon og økologi. Fagbokforlaget.
Academic literature review
  • 2019. The troublesome genus Thamnolia (lichenized Ascomycota). 221-226.
  • 2017. The development of lichenology in the history of botany. 37-44.

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