Kristian Hassel

Professor

Department of Natural History NTNU University Museum

kristian.hassel@ntnu.no +47 73592252 +47 92809839

Schøninghuset, B419, Kalvskinnet, Erling Skakkes gate 47A

Kristian Hassel is professor and Head of herbarium TRH at the NTNU University Museum. He is a botanist with particular interest in bryophyte biosystematics and ecology and he is teaching floristics at NTNU Department of Biology. He is leading the work on evaluation bryophytes for the Norwegian red list and is the President of the Nordic Bryological Society. The main emphasis of his research is the biodiversity and history of the bryophyte flora at northern latitudes. This involves metabarcoding and macro fossil studies of lake sediments, current effects of climate change in the Arctic (Zackenberg and Kobbefjord at Greenland), as well as studies on species distributions (phylogeography and species distribution modelling) and speciation processes in Sphagnum. Conservation and restoration of mires in relation to carbon fixation is of growing interest. Through the Norwegian Taxonomy Initiative he aims at barcoding the main bulk of Norwegian bryophyte species.

Scientific, academic and artistic work

Displaying a selection of activities. See all publications in the database

2020

Duffy, A; Aguero, Blanka; Stenøien, Hans K.; Flatberg, Kjell Ivar; Ignatov, MS; Hassel, Kristian; Shaw, AJ. (2020) Phylogenetic structure in the Sphagnum recurvum complex (Bryophyta: Sphagnaceae) relative to taxonomy and geography. American Journal of Botany. vol. 107.
Miller, Tara K.; Heegaard, Einar; Hassel, Kristian; Kapfer, Jutta. (2020) Environmental variables driving species composition in Subarctic springs in the face of climate change.
Miller, Tara K.; Heegaard, Einar; Hassel, Kristian; Kapfer, Jutta. (2020) Environmental variables driving species composition in subarctic springs in the face of climate change. Journal of Vegetation Science (JVS). vol. 32 (e12955).
Sandvik, Hanno; Hilmo, Olga; Henriksen, Snorre; Elven, Reidar; Åsen, Per Arvid; Hegre, Hanne; Pedersen, Oddvar; Pedersen, Per Anker; Solstad, Heidi; Vandvik, Vigdis; Westergaard, Kristine Bakke; Ødegaard, Frode; Åström, Sandra Charlotte Helene; Elven, Hallvard; Endrestøl, Anders; Gammelmo, Øivind; Hatteland, Bjørn Arild; Solheim, Halvor; Nordén, Björn; Sundheim, Leif; Talgø, Venche; Falkenhaug, Tone; Gulliksen, Bjørn; Jelmert, Anders; Oug, Eivind; Sundet, Jan Henry; Forsgren, Elisabet; Finstad, Anders Gravbrøt; Hesthagen, Trygve H.; Nedreaas, Kjell Harald; Wienerroither, Rupert; Husa, Vivian; Fredriksen, Stein; Sjøtun, Kjersti; Steen, Henning; Hansen, Haakon; Hamnes, Inger Sofie; Karlsbakk, Egil; Magnusson, Christer; Ytrehus, Bjørnar; Pedersen, Hans Christian; Swenson, Jon; Syvertsen, Per Ole; Stokke, Bård Gunnar; Gjershaug, Jan Ove; Dolmen, Dag; Kjærstad, Gaute; Johnsen, Stein Ivar; Jensen, Thomas Correll; Hassel, Kristian; Gederaas, Lisbeth. (2020) Alien species in Norway: Results from quantitative ecological impact assessments. Ecological Solutions and Evidence. vol. 1 (1).

2019

Jeong, So Young; Won, Boo Yeon; Hassel, Kristian; Cho, Tae Oh. (2019) Revision of Phymatolithon purpureum (Hapalidiales, Rhodophyta) based on ultrastructural and molecular data. European journal of phycology. vol. 54 (3).
Kyrkjeeide, Magni Olsen; Hassel, Kristian; Aguero, Blanka; Temsch, Eva M.; Afonina, Olga M.; Shaw, A. Jonathan; Stenøien, Hans K.; Flatberg, Kjell Ivar. (2019) Sphagnum Xlydiae, the first allotriploid peatmoss in the northern hemisphere. The Bryologist. vol. 122 (1).
Meleshko, Olena; Martin, Michael David; Szövényi, Péter; Stenøien, Hans K.; Hassel, Kristian. (2019) Speciation with gene flow in peatmosses - using whole genome sequencing to explore gene flow within and among species. The Bryological Times. vol. 149.
Ross, Louise C.; Speed, James David Mervyn; Øien, Dag-Inge; Grygoruk, Mateusz; Hassel, Kristian; Lyngstad, Anders; Moen, Asbjørn. (2019) Can mowing restore boreal rich-fen vegetation in the face of climate change?. PLOS ONE. vol. 14 (2).
Sandvik, Hanno; Dolmen, Dag; Elven, Reidar; Falkenhaug, Tone; Forsgren, Elisabet; Hansen, Haakon; Hassel, Kristian; Husa, Vivian; Kjærstad, Gaute; Ødegaard, Frode; Pedersen, Hans Christian; Solheim, Halvor; Stokke, Bård Gunnar; Åsen, Per Arvid; Åström, Sandra; Brandrud, Tor Erik; Elven, Hallvard; Endrestøl, Anders; Finstad, Anders Gravbrøt; Fredriksen, Stein; Gammelmo, Øivind; Gjershaug, Jan Ove; Gulliksen, Bjørn; Hamnes, Inger; Hatteland, Bjørn Arild; Hegre, Hanne; Hesthagen, Trygve; Jelmert, Anders; Jensen, Thomas C; Johnsen, Stein Ivar; Karlsbakk, Egil; Magnusson, Christer; Nedreaas, Kjell; Nordén, Björn; Oug, Eivind; Pedersen, Oddvar; Pedersen, Per Anker; Sjøtun, Kjersti; Skei, Jon Kristian; Solstad, Heidi; Sundheim, Leif; Swenson, Jon E; Syvertsen, Per Ole; Talgø, Venche; Vandvik, Vigdis; Westergaard, Kristine B; Wienerroither, Rupert; Ytrehus, Bjørnar; Hilmo, Olga; Henriksen, Snorre; Gederaas, Lisbeth. (2019) Alien plants, animals, fungi and algae in Norway: an inventory of neobiota. Biological Invasions. vol. 21 (10).
Yousefi, Narjes; Mikulášková, Eva; Stenøien, Hans K.; Flatberg, Kjell Ivar; Košuthová, Alica; Hájek, Michal; Hassel, Kristian. (2019) Genetic and morphological variation in the circumpolar distribution range of Sphagnum warnstorfii: indications of vicariant divergence in a common peatmoss. Botanical journal of the Linnean Society. vol. 189 (4).

2018

Hassel, Kristian. (2018) Hva er effekten av småkraftverkutbygging på moser som vokser på liggende dødved? Et populasjonsstudie av fakkeltvebladmose Scapania apiculata. Blyttia : Norsk botanisk forenings tidsskrift. vol. 76.
Hassel, Kristian; Kyrkjeeide, Magni Olsen; Yousefi, Narjes; Prestø, Tommy; Stenøien, Hans K.; Shaw, Jonathan A.; Flatberg, Kjell Ivar. (2018) Sphagnum divinum (sp. nov.) and S. medium Limpr. and their relationship to S. magellanicum Brid. Journal of Bryology. vol. 40 (3).
Hassel, Kristian; Wangen, Kristin; Gaarder, Geir; Jordal, John Bjarne. (2018) Nipdraugmose Anastrophyllum joergensenii - en svært sjelden art tilhørende en eksklusiv gruppe oseaniske levermoser. Blyttia : Norsk botanisk forenings tidsskrift. vol. 76.
Karlin, Eric F.; Robinson, Sean C; Hassel, Kristian; Flatberg, Kjell Ivar. (2018) Genetic analysis of four Île Amsterdam sphagna: high morphological divergence within Sphagnum subgenus Subsecunda. Journal of Bryology. vol. 40 (2).
Kyrkjeeide, Magni Olsen; Hassel, Kristian; Shaw, Blanca; Shaw, Jonathan; Temsch, Eva M.; Flatberg, Kjell Ivar. (2018) Sphagnum incundum a new species in Sphagnum subg. Acutifolia (Sphagnaceae) from boreal and arctic regions of North America. Phytotaxa. vol. 333 (1).
Lönnell, Niklas; Hassel, Kristian. (2018) New combinations within the genus Sphagnum (Sphagnaceae, Bryophyta. Phytotaxa. vol. 369.
Speed, James David Mervyn; Bendiksby, Mika; Finstad, Anders Gravbrøt; Hassel, Kristian; Kolstad, Anders Lorentzen; Prestø, Tommy. (2018) Contrasting spatial, temporal and environmental patterns in observation and specimen based species occurrence data. PLOS ONE. vol. 13 (4).
Vanneste, Thomas; Michelsen, Ottar; Graae, Bente Jessen; Kyrkjeeide, Magni Olsen; Holien, Håkon; Hassel, Kristian; Lindmo, Sigrid; Kapás, Rozália Erzsebet; de Frenne, Pieter. (2018) Correction to: Impact of climate change on alpine vegetation of mountain summits in Norway. Ecological Research.

2017

Aspaas, Aina Mærk; Guidetti, Roberto; Jönsson, K. Ingemar; Kaczmarek, Łukasz; Meier, Terje; Stur, Elisabeth; Prestø, Tommy; Hassel, Kristian; Boström, Erik; Hårsaker, Karstein; Ekrem, Torbjørn. (2017) Barcoding Norwegian water bears (Tardigrada). Genome. vol. 60 (11).
Ellis, LT; Alatas, M; Aleffi, M; Alegro, A.; Segota, V.; Ozimec, S.; Vukovic, N.; Koletic, N.; Prlic, D.; Bontek, M.; Asthana, AK; Gupta, D.; Sahu, V; Rawat, K.K.; Bakalin, VA; Klimova, K.G.; Baráth, K.; Beldiman, L.N.; Csiky, J; Deme, J; Cano, MJ; Guerra, J.; Czernyadjeva, I.V.; Dulin, M.V.; Erzberger, P; Ezer, T.; Fedosov, V.E.; Fontinha, S.; Sim-Sim, M; Garcia, C.A.; Martins, A.; Granzow-de la Cerda, I.; Sáez, L.; Hassel, Kristian. (2017) New national and regional bryophyte records, 52. Journal of Bryology. vol. 39 (3).
Lewis, Lily R.; Ickert-Bond, Stefanie M.; Biersma, Elisabeth M.; Convey, Peter; Goffinet, Bernard; Hassel, Kristian; Kruijer, Hans J.D.; La Farge, Catherine; Metzgar, Jordan; Stech, Michael; Villarreal, Juan Carlos; McDaniel, Stuart F.. (2017) Future directions and priorities for Arctic bryophyte research. Arctic Science. vol. 3 (3).
Vanneste, Thomas; Michelsen, Ottar; Graae, Bente Jessen; Kyrkjeeide, Magni Olsen; Holien, Håkon; Hassel, Kristian; Lindmo, Sigrid; Kapás, Rozália Erzsebet; De Frenne, Pieter. (2017) Impact of climate change on alpine vegetation of mountain summits in Norway. Ecological Research. vol. 32 (4).
Wangen, Kristin; Speed, James David Mervyn; Hassel, Kristian. (2017) How does microclimate affect the growth of the rare liverwort Scapania nimbosa?. Lindbergia. vol. 40.
Yousefi, Narjes; Hassel, Kristian; Flatberg, Kjell Ivar; Kemppainen, Petri; Trucchi, Emiliano; Shaw, A. Jonathan; Kyrkjeeide, Magni Olsen; Szövényi, Péter; Stenøien, Hans K.. (2017) Divergent evolution and niche differentiation within the common peatmoss Sphagnum magellanicum. American Journal of Botany. vol. 104 (7).

2016

Høitomt, Torbjørn; Brynjulvsrud, John Gunnar; Hassel, Kristian; Wangen, Kristin. (2016) Frostklokkemose Encalypta brevipes ny for Norges fastland på to lokaliteter i Lom i Oppland. Blyttia : Norsk botanisk forenings tidsskrift. vol. 74 (1).
Kyrkjeeide, Magni Olsen; Hassel, Kristian; Flatberg, Kjell Ivar; Shaw, A. Jonathan; Brochmann, Christian; Stenøien, Hans K.. (2016) Long-distance dispersal and barriers shape genetic structure of peatmosses (Sphagnum) across the Northern Hemisphere. Journal of Biogeography. vol. 43 (6).
Kyrkjeeide, Magni Olsen; Hassel, Kristian; Flatberg, Kjell Ivar; Shaw, A. Jonathan; Yousefi, Narjes; Stenøien, Hans K.. (2016) Spatial Genetic Structure of the Abundant and Widespread Peatmoss Sphagnum magellanicum Brid. PLOS ONE. vol. 11 (2).
Wangen, Kristin; Speed, James David Mervyn; Hassel, Kristian. (2016) Hyper-oceanic liverwort species of conservation concern: Evidence for dispersal limitation and identification of suitable uncolonised regions. Biodiversity and Conservation. vol. 25 (6).

2015

Epp, Laura; Gussarova, Galina; Boessenkool, Sanne; Olsen, J.; Haile, J; Schrøder-Nielsen, Audun; Ludikova, A.; Hassel, Kristian; Stenøien, Hans K.; Funder, S.; Willerslev, Eske; Kjær, K.; Brochmann, Christian. (2015) Lake sediment multi-taxon DNA from North Greenland records early post-glacial appearance of vascular plants and accurately tracks environmental changes. Quaternary Science Reviews. vol. 117.
Hassel, Kristian; Johnsen, John Inge; Jordal, John Bjarne; Knutsen, Asbjørn. (2015) Porella obtusata: distribution, ecology and threats at the west coast of Norway, the northern fringe of its European distribution. Lindbergia. vol. 38.
Høitomt, Torbjørn; Hassel, Kristian. (2015) Sporeklokkemose Encalypta longicolla funnet ny for Norge i Kåfjord i Troms. Blyttia : Norsk botanisk forenings tidsskrift. vol. 73 (2).
Kyrkjeeide, Magni Olsen; Hassel, Kristian; Stenøien, Hans K.; Prestø, Tommy; Boström, Erik; Shaw, Jonathan; Flatberg, Kjell Ivar. (2015) The dark morph of Sphagnum fuscum (Schimp.) H. Klinggr. In Europe is conspecific with the North American S. beothuk. Journal of Bryology. vol. 37 (4).
Nybø, Signe; Gundersen, Hege; Hassel, Kristian; Hovstad, Knut; Johansen, Line; Storaunet, Ken Olaf; van der Meeren, Gro Ingleid. (2015) Datakilder for naturindeks. Naturindeks for Norge. 2015. Økologisk rammeverk, beregningsmetoder, datalagring og nettbasert formidling.
Shaw, A. J; Shaw, B; Stenøien, Hans K.; Golinski, Karen; Hassel, Kristian; Flatberg, Kjell Ivar. (2015) Pleistocene survival, regional genetic structure and interspecific gene flow among three northern peat-mosses: Sphagnum inexspectatum, S. orientale and S. miyabeanum. Journal of Biogeography. vol. 42 (2).
Soininen, Eeva M; Gauthier, Gilles; Bilodeau, Frederic; Berteaux, Dominique; Gielly, Ludovic; Taberlet, Pierre; Gusarova, Galina; Bellemain, Eva; Hassel, Kristian; Stenøien, Hans K.; Epp, Laura; Schrøder-Nielsen, Audun; Brochmann, Christian; Yoccoz, Nigel Gilles. (2015) Highly overlapping winter diet in two sympatric lemming species revealed by DNA metabarcoding. PLOS ONE. vol. 10 (1).
Stene, Kathrine; Sætren, Anne; Gustafson, Lillian; Høeg, Helge Irgens; Hassel, Kristian; Samdal, Magne. (2015) Grimsdalen - et skattet landskap for villreinfangst og seterbruk. Fjellets kulturlandskap. Arealbruk og landskap gjennom flere tusen år.
Tretvik, Aud Mikkelsen; Aune, Egil Ingvar; Daverdin, Marc; Hassel, Kristian; Solem, Thyra Lise; Stenvik, Lars Fredrik; Øien, Dag-Inge; Austrheim, Gunnar. (2015) Budalen landskapsvernområde - seterdal med flere historiske lag. Fjellets kulturlandskap. Arealbruk og landskap gjennom flere tusen år.

2014

Antonsen, Atle; Golden, Johan; Hassel, Kristian. (2014) Norge en Mosestormakt. P4-Misjonen [Radio]. 2014-11-14.
Hansson, Elin; Hassel, Kristian; Høitomt, Torbjørn. (2014) Mosemysteriet. Fjell og Vidde [Tidsskrift]. 2014-08-04.
Harnes, Oddbjørn; Hassel, Kristian; Wangen, Kristin. (2014) Mystisk mose trigger forskerne. Romsdals Budstikke [Avis]. 2014-10-17.
Hassel, Kristian; Appelgren, Leif; Blom, Hans H.; Flynn, Kirstin M.; Gaarder, Geir; Heegaard, Einar; Høitomt, Torbjørn; Jordal, John Bjarne; Lima, Maria; Söderström, Lars; Wangen, Kristin. (2014) Colura calyptrifolia a new oceanic liverwort to Norway and Scandinavia. Lindbergia. vol. 37.
Hassel, Kristian; Brandslet, Steinar. (2014) Norge er en mosestormakt. http://gemini.no/2014/02/norge-er-en-mosestormakt/ [Internett]. 2014-02-21.
Hassel, Kristian; Holien, Håkon. (2014) Botanisk kartlegging i Markhus naturreservat. 2014. ISBN 978-82-7126-989-0.
Hassel, Kristian; Holien, Håkon. (2014) Moser og lav på Hårskallen i Øvre Forra naturreservat. 2014. ISBN 978-82-7126-990-6.
Hassel, Kristian; Prestø, Tommy; Zechmeister, H. (2014) Mosses (Bryophyta) and liverworts (Marchantoiphyta) of the Zackenberg valley, northeast Greenland. Lindbergia. vol. 37.
Hilmo, Olga; Hassel, Kristian; Holien, Håkon; Evju, Marianne; Nygård, Malene Østreng. (2014) Biodiversitet i plantefelt med gran (Picea abies) og i plantefelt med sitkagran (P. sitchensis). En sammenlignende studie. 2014. ISBN 978-82-426-2646-2. NINA rapport (1031).
Kyrkjeeide, Magni Olsen; Stenøien, Hans K.; Flatberg, Kjell Ivar; Hassel, Kristian. (2014) Glacial refugia and post-glacial colonization patterns in European bryophytes. Lindbergia. vol. 37.
Prestø, Tommy; Lüth, Michael; Hassel, Kristian. (2014) Bryophytes of the Longyearbyen area. 2014. ISBN 978-82-7126-997-5. NTNU Vitenskapsmuseet naturhistorisk notat (10).
Saure, Heidi Iren; Vandvik, Vigdis; Hassel, Kristian; Vetaas, Ole Reidar. (2014) Do vascular plants and bryophytes respond differently to coniferous invasion of coastal heathlands?. Biological Invasions. vol. 16 (4).
Stenøien, Hans K.; Hassel, Kristian; Segreto, Rossana; Gabriel, Rosalina; Karlin, EF; Shaw, A. J; Flatberg, Kjell Ivar. (2014) High morphological diversity in remote island populations of the peat moss Sphagnum palustre: glacial refugium, adaptive radiation or just plasticity?. The Bryologist. vol. 117 (2).

2013

Flatberg, Kjell Ivar; Hassel, Kristian. (2013) Utkast til handlingsplaner for gulsymre Anemone ranunculoides, norsk timian Thymus praecox subsp. arcticus, lundgrønnaks Brachypodium sylvaticum, skogflatbelg, Lathyrus sylvestris, og svartertekanpp Lathyrus niger i Nord-Trøndelag fylke. 2013. NTNU Vitenskapsmuseet naturhistorisk rapport (5).
Hassel, Kristian; Horg, Beate. (2013) Moser til med nye arter. Forskning.no [Internett]. 2013-10-04.
Hassel, Kristian; Høitomt, Torbjørn. (2013) Tortella vrimoseslekta i Norge, nye arter og arter vi kan være på utkikk etter. [The genus Tortella in Norway, new species and species to look out for.]. Blyttia : Norsk botanisk forenings tidsskrift. vol. 71.
Hassel, Kristian; Segreto, Rossana; Ekrem, Torbjørn. (2013) Restricted variation in plant barcoding markers limits identification in closely related bryophyte species. Molecular Ecology Resources. vol. 13 (6).
Høitomt, Torbjørn; Hassel, Kristian. (2013) Tanntustmose Tortula lanceola og kalkbegermose Microbryum davallianum var. commutatum gjenfunnet på øyene i Oslofjorden. [Tortula lanceola and Microbryum davallianum var. commutatum rediscovered on the inner islands of the Oslo fjord]. Blyttia : Norsk botanisk forenings tidsskrift. vol. 71.
Saure, Heidi Iren; Vandvik, Vigdis; Hassel, Kristian; Vetaas, Ole Reidar. (2013) Effects of invasion by introduced versus native conifers on coastal heathland vegetation. Journal of Vegetation Science (JVS). vol. 24 (4).
Soininen, Eeva Marjatta; Zinger, Lucie; Gielly, Ludovic; Bellemain, Eva; Bråthen, Kari Anne; Brochmann, Christian; Epp, Laura; Gusarova, Galina; Hassel, Kristian; Henden, John-André; Killengreen, Siw Turid; Rämä, Teppo; Stenøien, Hans; Yoccoz, Nigel; Ims, Rolf Anker. (2013) Shedding new light on the diet of Norwegian lemmings: DNA metabarcoding of stomach content. Polar Biology. vol. 36 (7).
Stech, M; Veldman, S; Larrain, J; Muñoz, Jesus; Quandt, D; Hassel, Kristian; Kruijer, H. (2013) Molecular Species Delimitation in the Racomitrium canescens Complex (Grimmiaceae) and Implications for DNA Barcoding of Species Complexes in Mosses. PLOS ONE. vol. 8 (1).
Strand, Tonhild Solberg; Hassel, Kristian. (2013) Mose-sensajon i Kongsberg. Moser til med ny moseart. Laagendalsposten [Avis]. 2013-10-03.
Vorren, Tore Ola; Vorren, Karl-Dag; Aasheim, Odd; Dahlgren, K.I.Torbjørn; Forwick, Matthias; Hassel, Kristian. (2013) Palaeoenvironment in northern Norway between 22.2 and 14.5 cal. ka BP. Boreas. vol. 42 (4).

2012

Pineiro, Rosalia; Popp, Magnus; Hassel, Kristian; Listl, Daniela; Westergaard, Kristine Bakke; Flatberg, Kjell Ivar; Stenøien, Hans K.; Brochmann, Christian. (2012) Circumarctic dispersal and long-distance colonization of South America: the moss genus Cinclidium. Journal of Biogeography. vol. 39 (11).
Epp, Laura; Boessenkool, Sanne; Bellemain, Eva; Haile, James; Esposito, Alfonso; Riaz, Tiayyba; Erséus, Christer; Gusarov, Vladimir; Edwards, Mary E.; Johnsen, Arild; Stenøien, Hans K.; Hassel, Kristian; Kauserud, Håvard; Yoccoz, Nigel; Bråthen, Kari Anne; Willerslev, Eske; Taberlet, Pierre; Coissac, Eric; Brochmann, Christian. (2012) New environmental metabarcodes for analysing soil DNA: potential for studying past and present ecosystems. Molecular Ecology. vol. 21 (8).
Hassel, Kristian. (2012) Ekspertgruppen for moser. Fremmede arter i Norge - med norsk svarteliste 2012.
Hassel, Kristian. (2012) Svartnål Anthoceros agrestis ny for Midt-Norge. Blyttia : Norsk botanisk forenings tidsskrift. vol. 70 (2).
Hassel, Kristian; Holien, Håkon. (2012) Epifyttfloraen av moser og lav på Kalvøya, Vikna i Nord-Trøndelag. 2012. NTNU Vitenskapsmuseet Botanisk notat (3).
Hassel, Kristian; Prestø, Tommy; Schmidt, Niels M.. (2012) Bryophyte diversity in high and low arctic Greenland. 2012. ISBN 978-87-92825-51-3. Scientific Report from DCE - Danish Centre for Environment and Energy (27).
Høitomt, Torbjørn; Appelgren, Leif; Lönnell, Niklas; Lye, Kåre; Hassel, Kristian. (2012) Pyramidula tetragona (Brid.) Brid. rediscovered in Fennoscandia and new to Norway. Lindbergia. vol. 35.
Karlin, EF; Hotchkiss, SC; Boles, SB; Stenøien, Hans K.; Hassel, Kristian; Flatberg, Kjell Ivar; Shaw, A. J.. (2012) High genetic diversity in a remote island population system: sans sex. New Phytologist. vol. 193 (4).
Kyrkjeeide, Magni Olsen; Hassel, Kristian; Flatberg, Kjell Ivar; Stenøien, Hans K.. (2012) The rare peat moss Sphagnum wulfianum (Sphagnaceae) did not survive the last glacial period in northern European refugia. American Journal of Botany. vol. 99 (4).
Lyngstad, Anders; Fremstad, Eli; Solem, Thyra Lise; Hassel, Kristian. (2012) Botanisk kartlegging og vurdering av konsekvenser i forbindelse med foreslått utvidelse av kalkbrudd i Tromsdalen, Verdal kommune. 2012. ISBN 978-82-7126-940-1. Rapport (1).
Solem, Thyra Lise; Aune, Egil Ingvar; Daverdin, Marc; Hassel, Kristian; Sjøgren, Per Johan E; Stenvik, Lars; Tretvik, Aud Mikkelsen; Øien, Dag-Inge; Austrheim, Gunnar. (2012) Long-term land-use and landscape dynamics in Budalen, central Norway. International Journal of Biodiversity Science, Ecosystem Services & Management. vol. 8 (4).

2011

Evju, Marianne; Hassel, Kristian; Hagen, Dagmar; Erikstad, Lars. (2011) Småkraftverk og sjeldne moser og lav. Kunnskap og kunnskapsmangler. 2011. ISBN 978-82-426-2281-5. NINA rapport (696).
Holien, Håkon; Hassel, Kristian; Brandrud, Tor Erik. (2011) Kartlegging av kalkskog i Nord-Trøndelag III. 2011. ISBN 978-82-7126-922-7. Rapport (1).
Kjærstad, Gaute; Bergan, Morten Andre; Hassel, Kristian; Thingstad, Per Gustav; Aanes, Karl Jan; Arnekleiv, Jo Vegar. (2011) Biologiske og vannkjemiske undersøkelser i forbindelse med planlagt rassikring av Hofstadelva, Stjørdal. 2011. Notat (Vitenskapsmuseet. Zoologisk avdeling) (7).
Lyngstad, Anders; Hassel, Kristian. (2011) Naturindeks på fjell. Overvåkingsfelt for fjellfiltmose Aulacomnium turgidum og fjellgittermose Cinclidium arcticum på Midtre Knutshøa, Oppdal kommune. 2011. ISBN 978-82-7126-921-0. NTNU Vitenskapsmuseet Botanisk notat (3).
Solem, Thyra Lise; Stenvik, Lars; Tretvik, Aud Mikkelsen; Hassel, Kristian; Øien, Dag-Inge; Aune, Egil Ingvar; Sjögren, Per; Daverdin, Marc; Austrheim, Gunnar; Kyrkjeeide, Magni Olsen. (2011) Natur- og kulturminner i Budalen landskapsvernområde. Arkeologiske, historiske, vegetasjonshistoriske og økologiske undersøkelser i DYLAN-prosjektet. 2011. ISBN 978-82-7126-933-3. Rapport Botanisk Serie (5).
Stenøien, Hans K.; Shaw, A. J.; Shaw, B; Hassel, Kristian; Gunnarsson, U. (2011) North American origin and recent European establishments of the amphi-Atlantic peat moss Sphagnum angermanicum. Evolution. vol. 65 (4).

2010

Hassel, Kristian; Blom, Hans H.; Flatberg, Kjell Ivar; Halvorsen, Rune; Johnsen, Jon Inge. (2010) Moser Anthocerophyta, Marchantiophyta, Bryophyta. Norsk rødliste for arter 2010. The 2010 Norwegian Red List for Species.
Flatberg, Kjell Ivar; Hassel, Kristian; Kyrkjeeide, Magni Olsen. (2010) Huldretorvmose Sphagnum wulfianum i Norge, med spesiell omtale av en forekomst på Trøndelagskysten :. Blyttia : Norsk botanisk forenings tidsskrift. vol. 68 (3).
Hassel, Kristian. (2010) Mosefloraen på Ladehalvøya, Trondheim kommune. 2010. ISBN 978-82-7126-901-2. Rapport (4).
Hassel, Kristian; Holien, Håkon. (2010) Kartlegging av kalkskog i Steinkjer og Snåsa, Nord-Trøndelag. 2010. ISBN 978-82-7126-903-6. Rapport (6).
Hassel, Kristian; Prestø, Tommy. (2010) Fra østkyst til vestkyst på Grønland med mose i lupen. Medlemsmøte i foreningen . Norsk botanisk forening, Trøndelagsavdelingen; Trondheim. 2010-12-06 - 2010-12-06.
Holien, Håkon; Hassel, Kristian. (2010) Botanisk kartlegging i Blåfjella - Skjækerfjella nasjonalpark. 2010. ISBN 9788271269029.
Jordal, John Bjarne; Hassel, Kristian. (2010) The rare liverwort Scapania nimbosa – new knowledge about distribution and ecology in Norway. Lindbergia. vol. 33.
Segreto, Rossana; Hassel, Kristian; Bardal, Renate Kvernberg; Stenøien, Hans K.. (2010) Desiccation tolerance and natural cold acclimation allow cryopreservation of bryophytes without pretreatment or use of cryoprotectants. The Bryologist. vol. 113 (4).

2009

Moen, Asbjørn; Dolmen, Dag; Hassel, Kristian; Ødegaard, Frode. (2009) Myr, kilde og flommark - Miljøforhold og påvirkninger på rødlistearter. 2009. ISBN 978-82-92838-25-9.
Eivindsen, Tove; Hassel, Kristian; Prestø, Tommy. (2009) Moser som klimavarsler. forskning.no [Internett]. 2009-09-30.
Hassel, Kristian. (2009) Kartlegging og overvåking av barkhårstjerne Syntrichia virescens i Trondheim kommune. 2009. ISBN 978-82-7126-824-4. NTNU Vitenskapsmuseet Botanisk notat (3).
Hassel, Kristian. (2009) Mosefloraen på ytre deler av Byneset, Trondheim koomune. 2009. ISBN 978-82-7126-820-6. Rapport (3).
Hassel, Kristian. (2009) Overvåking av fakkeltvebladmose Scapania apiculata ved Grytbakk i Rindal kommune. 2009. ISBN 978-82-7126-822-0. NTNU Vitenskapsmuseet Botanisk notat (2).
Hassel, Kristian; Holien, Håkon; Brandrud, Tor Erik. (2009) Kartlegging av kalkskog i Steinkjer og Snåsa kommuner i Nord-Trøndelag. 2009. ISBN 978-82-7126-823-7. Rapport (4).

2008

Austrheim, Gunnar; Mysterud, A; Pedersen, Bård; Halvorsen, R; Hassel, Kristian; Evju, M. (2008) Large scale experimental effects of three levels of sheep densities on an alpine ecosystem. Oikos. vol. 117.
Brox, Karl H.; Hassel, Kristian. (2008) Særegen vegetasjon i fosserøyken. Adresseavisen [Avis]. 2008-10-30.
Hassel, Kristian; Bjøru, Stein. (2008) På jakt etter barkhårstjerna. Adresseavisen [Avis]. 2008-06-09.

2007

Austrheim, Gunnar; Mysterud, Atle; Hassel, Kristian; Evju, Marianne; Økland, Rune Halvorsen; Økland, Rune Halvorsen. (2007) Interactions between sheep, rodents, graminoids, and bryophytes in an oceanic alpine ecosystem of low productivity. Écoscience. vol. 14 (2).

2006

Flatberg, Kjell Ivar; Holm, Hans H; Hassel, Kristian; Økland, Rune Halvorsen. (2006) Moser - Anthocerophyta, Marchantiophyta, Bryophyta. Norsk Rødliste 2006.
Hassel, Kristian. (2006) Plant conservation in Svalbard, Bjørnøya and Jan Mayen. European plant data sheets. Plant Talk.
Hassel, Kristian; Jordal, John Bjarne; Gaarder, Geir. (2006) Scapania apiculata, S. carinthiaca og S. glaucocephala, tre sjeldne levermoser på død ved i bekkekløfter og småvassdrag. Blyttia : Norsk botanisk forenings tidsskrift. vol. 64 (3).

2005

Austrheim, Gunnar; Evju, Marianne; Hassel, Kristian; Lindgren, Synøve; Mysterud, Atle. (2005) Effekter av sauebeite på planter i Hol, Buskerud. Økologiske effekter av sauebeiting i høyfjellet: korttidseffekter.
Austrheim, Gunnar; Hassel, Kristian; Mysterud, Atle. (2005) The role of life history traits for bryophyte community patterns in two contrasting alpine regions. The Bryologist. vol. 108 (2).
Gaarder, Geir; Hassel, Kristian. (2005) Torntvebladmose Scapania nimbosa gjennfunnet i Norge. Blyttia : Norsk botanisk forenings tidsskrift. vol. 63.
Gunnarsson, Urban; Hassel, Kristian; Söderström, Lars. (2005) Genetic structure of the endangered peat moss Sphagnum angermanicum in Sweden: a result of historic or contemporary processes?. The Bryologist. vol. 108.
Hassel, Kristian; Jordal, John Bjarne; Ropstad, Erlend. (2005) Mikroskopisk sjeldenhet. Opp [Avis]. 2005-08-04.
Hassel, Kristian; Pedersen, Bård; Söderström, Lars. (2005) Age and size at maturity in mountain and lowland populations of the expanding moss Pogonatum dentatum. Plant Ecology. vol. 179.
Hassel, Kristian; Pedersen, Bård; Söderström, Lars. (2005) Changes in life-history traits in an expanding moss species: phenotypic plasticity or genetic differentiation? A reciprocal transplantation experiment with Pogonatum dentatum. Ecography. vol. 28.
Hassel, Kristian; Söderström, Lars. (2005) The expansion of the alien mosses Orthodontium lineare and Campylopus introflexus in Britain and continental Europe. Journal of the Hattori Botanical Laboratory. vol. 97.
Hassel, Kristian; Såstad, Sigurd M.; Gunnarsson, Urban; Söderström, Lars. (2005) Genetic variation and structure in the expanding moss Pogonatum dentatum in its area of origin and in a recently colonised area. American Journal of Botany. vol. 92.

2003

Hassel, Kristian. (2003) Acaulon mediterraneum Limpr. confirmed for Norway, with remarks on the redlisted A. muticum (Hedw.) Müll. Hal. Lindbergia. vol. 28.
Hassel, Kristian; Söderström, Lars. (2003) Life history variation of Pogonatum dentatum (Brid.) Brid. in contrasting habitats. Journal of the Hattori Botanical Laboratory. vol. 93.

2002

Blom, Hans H.; Hassel, Kristian; Prestø, Tommy. (2002) Moser. Miljøregistrering i skog - biologisk mangfold. Hovedrapport.
Hassel, Kristian. (2002) Skjoldblad, Hydrocotyle vulgaris funnet i Solund kommune i Sogn og Fjordane. Blyttia : Norsk botanisk forenings tidsskrift. vol. 60 (2).

2001

Blom, Hans H.; Gaarder, Geir; Hassel, Kristian; Prestø, Tommy. (2001) Mer om grønnsko Buxbaumia viridis i Norge - hvor godt kjenner vi dens økologi og utbredelse?. Blyttia : Norsk botanisk forenings tidsskrift. vol. 59 (1).
Hassel, Kristian; Bratt, Lennart. (2001) Scapania glaucocephala (Taylor) Austin in Scandinavia. Lindbergia. vol. 26.

2000

Hassel, Kristian. (2000) Bryophyte profiles, 2. Pogonatum dentatumm (Brid.) Brid. (Bryopsida: Polytrichaceae). Journal of Bryology. vol. 22.
Hassel, Kristian. (2000) Frullania bolanderi Aust. er funnet på en ny lokalitet i Norge. Myrinia : Föreningen Mossornas vänners tidskrift. vol. 10.
Hassel, Kristian; Gaarder, Geir; Jarle I., Holten. (2000) Torntvibladmose Scapania nimbosa utdødd i Norge?. Blyttia : Norsk botanisk forenings tidsskrift. vol. 58.

1999

Hassel, Kristian; Gaarder, Geir. (1999) Grønnsko Buxbaumia viridis: nyfunn, utbredelse og status i Norge. Blyttia : Norsk botanisk forenings tidsskrift. vol. 57.
Hassel, Kristian; Söderström, Lars. (1999) Spore germination in the laboratory and spore establishment in the field in Pogonatum dentatum (Brid.) Brid. Lindbergia. vol. 5.

1998

Hassel, Kristian; Løe, Geir. (1998) To nye funn av den rødlista levermosen fossegrimemose Herbertus stramineus. Blyttia : Norsk botanisk forenings tidsskrift. vol. 56.
Hassel, Kristian; Söderström, Lars. (1998) The presence of Pogonatum dentatum (Brid.) Brid. in roadside diapsore banks in Sweden. Lindbergia.
Söderström, Lars; Abolina, Austra; Blom, Hans H; Damsholt, Kell; Enroth, Johannes; Fagerstén, Reino; Frisvoll, Arne A.; Haapasaari, Matti; Hassel, Kristian; Hedenäs, Lars; Heegaard, Einar; m, fl. (1998) Preliminary distribution maps of bryophytes in northwestern Europe. ..

1997

Løe, Geir; Hassel, Kristian; Brobakk, Trond Einar. (1997) Herbertus aduncus ny for Hordaland. Myrinia : Föreningen Mossornas vänners tidskrift. vol. 7.

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