Geir-Harald-Mathiassen.-foto-June-Åsheim
Photo: June Åsheim

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Geir Harald Mathiassen

The Arctic University Museum of Norway

Job description:

Curator of Cryptogamic herbarium (TROM)




Research interests

Pyrenomycetes (Ascomycetes)

Taxonomy, ecology and distribution in northern regions

Publications in CRIStin


  • Zamora, Juan Carlos; Svensson, Måns; Kirschner, Roland; Olariaga, Ibai; Ryman, Svengunnar; Parra, Luis Alberto; Geml, József; Rosling, Anna; Adamčík, Slavomír; Ahti, Teuvo; Aime, M. Catherine; Ainsworth, Martyn; Albert, László; Alberto, Altés Garcia; Albertó, Edgardo; Aronsen, Arne; Arup, Ulf; Asgari, Didier; Assyov, Boris; Atienza, Violeta; Bandini, Ditte; Baptista-Ferreira, João Luís; Baral, Hans-Otto; Bendiksby, Mika; Bendiksen, Egil; Bendiksen, Katriina; Brandrud, Tor Erik; Frisch, Andreas; Gulden, Gro; Høiland, Klaus; Holien, Håkon; Jørgensen, Per Magnus; Larsson, Karl-Henrik; Mathiassen, Geir Harald; Ronikier, Anna; Salcedo, Isabel; Schulz, Barbara; Schumacher, Trond; Senn-Irlet, Beatrice; Spribille, Toby; Taskin, Hatira; Timdal, Einar; Tønsberg, Tor; Vellinga, Else C; Vizzini, Alfredo; Vetlesen, Per; Voglmayr, Hermann; Wedin, Mats; Weholt, Øyvind; Westberg, Martin. Considerations and consequences of allowing DNA sequence data as types of fungal taxa. IMA Fungus 2018; Volum 9 (1). ISSN 2210-6340.s 167 - 175.s doi: 10.5598/imafungus.2018.09.01.10.

  • Mathiassen, Geir Harald; Granmo, Alfred; Stensrud, Øyvind. Lophiotrema lennartii and Lophiotrema kerstiniae – two new species from Norway and Sweden.. Sydowia 2017; Volum 69. ISSN 0082-0598.s 199 - 303.s doi: 10.12905/0380.sydowia69-2017-0199.

  • Mathiassen, Geir Harald; Granmo, Alfred; Stensrud, Øyvind. Lophiotrema borealiforme, a new species close to L. boreale.. Karstenia 2017; Volum 57. ISSN 0453-3402.s 11 - 15.s doi: 10.29203/ka.2017.479.

  • Rämä, Teppo; Davey, Marie Louise; Nordén, Jenni; Halvorsen, Rune; Blaalid, Rakel; Mathiassen, Geir Harald; Alsos, Inger Greve; Kauserud, Håvard. Fungi sailing the Arctic ocean: speciose communities in North Atlantic driftwood as revealed by high-throughput amplicon sequencing. Microbial Ecology 2016; Volum 72 (2). ISSN 0095-3628.s 295 - 304.s doi: 10.1007/s00248-016-0778-9.

  • Mathiassen, Geir Harald; Granmo, Alfred; Rämä, Teppo. Barrmaelia pseudobombarda (Ascomycota), a rare European species with a peculiar disjunct distribution. Österreichische Zeitschrift für Pilzkunde 2015; Volum 24. ISSN 1021-2450.s 9 - 13.

  • Boehm, Eric WA; Marson, Guy; Mathiassen, Geir Harald; Gardiennet, Alain; Schoch, Conrad L. An overview of the genus Glyphium and its phylogenetic placement in Patellariales. Mycologia 2015; Volum 107 (3). ISSN 0027-5514.s 607 - 618.s doi: 10.3852/14-191.

  • Rämä, Teppo; Nordén, Jenni; Davey, Marie; Mathiassen, Geir Harald; Spatafora, Joseph W.; Kauserud, Håvard. Fungi ahoy! Diversity on marine wooden substrata in the high North. Fungal ecology 2014; Volum 8. ISSN 1754-5048.s 46 - 58.s doi: 10.1016/j.funeco.2013.12.002.

  • Mathiassen, Geir Harald; Granmo, Alfred; Rämä, Teppo. Lophium elegans (Ascomycota), a rare European species. Mycotaxon 2014; Volum 129 (2). ISSN 0093-4666.s 433 - 438.s doi: 10.5248/129.433.

  • Rämä, Teppo; Mathiassen, Geir Harald; Kauserud, Håvard. Marine fungi new to Norway, with an outlook to the overall diversity. Agarica 2014; Volum 35. ISSN 0800-1820.s 35 - 47.

  • Mathiassen, Geir Harald; Granmo, Alfred. Rhynchostoma minutum (Ascomycota), en særegen og sjelden sekksporesopp i Norge. Agarica 2013; Volum 33. ISSN 0800-1820.s 87 - 91.

  • Granmo, Alfred; Mathiassen, Geir Harald. A new species of Dothiopeltis from Norway. Sydowia 2013; Volum 65 (2). ISSN 0082-0598.s 343 - 348.

  • Mathiassen, Geir Harald; Granmo, Alfred; Rämä, Teppo. Saccardoella kanderana (Ascomycota) - species and genus new to Finland. Karstenia 2013; Volum 53. ISSN 0453-3402.

  • Granmo, Alfred; Rämä, Teppo; Mathiassen, Geir Harald. The secrets of Cryptomyces maximus (Rhytismataceae) - Ecology and distribution in Norden, and a morphological and ontogenetic update. Karstenia 2012. ISSN 0453-3402.

  • Bjerke, Jarle Werner; Mathiassen, Geir Harald; Granmo, Alfred; Tibell, Leif. Phaeocalicium compressulum new to North Norway. Graphis Scripta 2011; Volum 23. ISSN 0901-7593.s 33 - 35.

  • Mathiassen, Geir Harald; Granmo, Alfred. Amphisphaerella erikssonii (Ascomycota), en sjelden art med ny nordgrense i Norge. Agarica 2011; Volum 31. ISSN 0800-1820.s 123 - 127.

  • Mathiassen, Geir Harald; Granmo, Alfred. Ophiognomonia (Ascomycota) new to Norway. Agarica 2011; Volum 30. ISSN 0800-1820.s 77 - 80.

  • Mathiassen, Geir Harald; Granmo, Alfred; Eyjólfsdóttir, Guðríður Gyða; Stensrud, Øyvind. Hypoxylon macrosporum P. Karst., a new species for Iceland. Acta Botanica Islandica 2011 (15). ISSN 0374-5066.s 3 - 9.

  • Mathiassen, Geir Harald; Granmo, Alfred; Rämä, Teppo. Hypoxylon macrosporum P.Karst. (Xylariaceae) new to Finland - and a new northern limit. Karstenia 2011; Volum 51 (1). ISSN 0453-3402.s 17 - 22.

  • Mathiassen, Geir Harald; Granmo, Alfred; Bottolfsen, Trine; Marstad, Per. Gulnende reddikmusserong (Tricholoma sulphurescens Bres.) i Norge. Agarica 2007; Volum 27. ISSN 0800-1820.s 13 - 17.

  • Mathiassen, Geir Harald; Økland, Rune Halvorsen; Økland, Rune Halvorsen. Relative importance of host tree species and environmental gradients for epiphytic species composition, exemplified by pyrenomycetes s. lat. (Ascomycota) on Salix in central north Scandinavia. Ecography 2007; Volum 30. ISSN 0906-7590.s 251 - 263.s doi: 10.1111/j.2006-0906-7590-04665.x.

  • Mathiassen, Geir Harald; Granmo, Alfred. Beltekullsopp (Daldinia concentrica) i Norge. Status og historisk oversikt. Polarflokken 2002; Volum 26 (2). ISSN 0332-9119.s 133 - 143.

  • Granmo, Alfred; Mathiassen, Geir Harald. Albatrellus syringae and A. Peckianus (Albatrellaceae): taxonomic remarks and world distribution. Karstenia 2001; Volum 41. ISSN 0453-3402.s 49 - 54.

  • Mathiassen, Geir Harald; Granmo, Alfred. Om et funn av beltekullsopp i Nordreisa (Troms) � en sopp som inntil nylig har vært kalt Daldinia concentrica (Bolton : Fr.) Ces. & De Not. Polarflokken 2001; Volum 25 (1). ISSN 0332-9119.s 103 - 106.

  • Mathiassen, Geir Harald. Glyphium grisonense Math. Norwegian Fungus of the Month � January 2001 (Mytilinidiaceae, Dothidiales, Incertae sedis, Ascomycota). http://www.uio.no/conferences/imc7/ 2001.

  • Granmo, Alfred; Mathiassen, Geir Harald. Albatrellus syringae (Albatrellaceae) in Fennoscandia and the Baltic region: ecology and distribution. Karstenia 2001; Volum 41. ISSN 0453-3402.s 37 - 48.

  • Granmo, Alfred; Mathiassen, Geir Harald. Stubbehorn (Xyrlaria) i Nord-Norge. Polarflokken 2000; Volum 24 (2). ISSN 0332-9119.s 147 - 154.

  • Mathiassen, Geir Harald; Granmo, Alfred; Abelsen, Oddrun. Bestemmelse av ukjent sopp over telefon � et tvilsomt foretak. Seig østerssopp (Pleurotus dryinus s.l.) i Norge. Polarflokken 2000; Volum 24 (1). ISSN 0332-9119.s 41 - 48.

  • Mathiassen, Geir Harald; Granmo, Alfred; Skifte, Ola. Tretti år med gulporet fåresopp (Albatrellus syringae) i Nord-Norge, og dens nåværende norske utbredelse. Polarflokken 1999; Volum 23 (2). ISSN 0332-9119.s 155 - 162.

  • Barr, Margaret E.; Mathiassen, Geir Harald. Proposed redisposition of Schizostoma vicinum and a newly recognized taxon. Mycotaxon 1998; Volum 69. ISSN 0093-4666.s 159 - 165.

  • Mathiassen, Geir Harald; Granmo, Alfred. The 11th Nordic Mycological Congress in Skibotn, North Norway 1992. Rapport 1995. ISSN 0802-2992.s 1 - 77.

  • Mathiassen, Geir Harald. Corticolous and lignicolous Pyrenomycetes s. lat. (Ascomycetes) on Salix along a mid-Scandinavian transect. Sommerfeltia 1993; Volum 20. ISSN 0800-6865.s 1 - 180.

  • Mathiassen, Geir Harald. Some corticolous and lignicolous Pyrenomycetes s. lat. (Ascomycetes) on Salix in Troms, N Norway. Sommerfeltia 1989; Volum 9. ISSN 0800-6865.s 1 - 100.

  • Mathiassen, Geir Harald. Vrangpipe Merismodes anomalus (Pers. ex Fr.) Sing. en interessant vedboende sopp. Polarflokken 1982; Volum 6 (2). ISSN 0332-9119.s 115 - 122.

  • Rämä, Teppo; Davey, Marie Louise; Nordén, Jenni; Halvorsen, Rune; Blaalid, Rakel; Mathiassen, Geir Harald; Alsos, Inger Greve; Kauserud, Håvard. High-throughput amplicon sequencing reveals high fungal diversity in North Atlantic driftwood. Marine microbiome - discovery & innovation 2016-06-27 - 2016-06-30 2016.

  • Mathiassen, Geir Harald; Granmo, Alfred; Jenssen, Kolbjørn Mohn. Et oppsiktsvekkende soppfunn i Lavangsdalen (Troms). Polarflokken 2016; Volum 38 (2). ISSN 0332-9119.s 113 - 128.

  • Rämä, Teppo; Nordén, Jenni; Davey, Marie; Mathiassen, Geir Harald; Spatafora, JW; Kauserud, Håvard. Diversity of wood-inhabiting marine fungi in the high North. Asian Mycological Conference 2013, 13th International Marine and Freshwater Mycology Symposium 2013-08-20 - 2013.

  • Mathiassen, Geir Harald; Granmo, Alfred. Sluttrapport for Artsprosjektet Sekksporesopper i Finnmark 2010 – 2011. Tromsø Museum, Universitetsmuseet 2012, ADB 56-09, Prosjekt 70184216. 2012.

  • Mathiassen, Geir Harald; Granmo, Alfred; Rämä, Teppo. Livets ark 23: Fagervokssopp Hygrophorus calophyllus. (fulltekst) 2011.

  • Rämä, Teppo; Mathiassen, Geir Harald. Livets ark 11: Marin sekksporesopp, Amylocarpus encephaloides. (fulltekst) 2010.

  • Mathiassen, Geir Harald; Granmo, Alfred; Marstad, Per. Soppfunn i Troms høsten 2003 - med kommentarer til interessante, sjeldne og rødlista arter (Polarflokken 2005). Polarflokken 2008; Volum 29 (1-2). ISSN 0332-9119.s 3 - 26.

  • Mathiassen, Geir Harald; Granmo, Alfred; Marstad, Per. Vårtrevlesopp Inocybe ereubescens - en sjelden rødlisteart med ny nordgrense i Norge (Polarflokken 2005). Polarflokken 2008; Volum 29 (1-2). ISSN 0332-9119.s 27 - 31.

  • Granmo, Alfred; Mathiassen, Geir Harald. Soppforeninger i Norge og litt nordnorsk sopphistorie. Polarflokken 2005; Volum 29 (1). ISSN 0332-9119.

  • Mathiassen, Geir Harald. Review and evaluation of the article �Molecular phylogeny of Leptosphaeria and Phaeosphaeria�, in relation to my project on the Lophiostomataceae sensu lato. 2002.

  • Mathiassen, Geir Harald. Alfred Granmo - doktorgrad i mykologi ved Universitetet i Tromsø på sitt arbeid om råtesopper og halvparasittære sopper på nordiske lauvtrær. Polarflokken 2000; Volum 24 (2). ISSN 0332-9119.s 179 - 187.

  • Mathiassen, Geir Harald; Granmo, Alfred; Engelskjøn, Torstein. Curator emeritus Ola Skifte � 75 years old. Agarica 1998; Volum 15. ISSN 0800-1820.s 7 - 7.

  • Granmo, Alfred; Mathiassen, Geir Harald; Schumacher, Trond. Biologisk mangfold i soppriket. Ottar 1998; Volum 222 (4). ISSN 0030-6703.s 17 - 24.

  • Mathiassen, Geir Harald. De naturhistoriske samlingene ved Tromsø Museum sett i sammenheng med Universitetsmuseenes naturhistoriske dokumentasjonsprosjekt (UNADOK). 1996.

  • Granmo, Alfred; Mathiassen, Geir Harald; Mørkved, Brynhild. Ola Skifte. Polarflokken 1993; Volum 17 (2). ISSN 0332-9119.s 177 - 178.

  • Mathiassen, Geir Harald. Corticolous and lignicolous Pyrenomycetes s. lat. (Asco-mycetes) on Salix along a mid-Scandinavian transect. 1992.

  • Mathiassen, Geir Harald. Sopp fra Svanvik, Sør-Varanger, 1990. Polarflokken 1990; Volum 14 (2). ISSN 0332-9119.s 195 - 203.

  • Mathiassen, Geir Harald. Brunsporinger. Ottar 1987; Volum 167 (4). ISSN 0030-6703.s 30 - 33.

  • Mathiassen, Geir Harald. Svartsporinger. Ottar 1987; Volum 167 (4). ISSN 0030-6703.s 25 - 29.

  • Mathiassen, Geir Harald. Pyrenomyceter (Ascomyceter) på Salix i Troms. 1985.

  • Mathiassen, Geir Harald. Kjuketur 8. mai med Gaute Mohn Jenssen. Polarflokken 1984; Volum 8 (3). ISSN 0332-9119.s 169 - 170.

  • Mathiassen, Geir Harald. Sopptur til Straumsbukta, Kvaløya, Tromsø kommune. Blyttia : Norsk botanisk forenings tidsskrift 1983; Volum 41 (2). ISSN 0006-5269.s 85 - 86.

  • Mathiassen, Geir Harald. Soppekskursjon til Dividalen. Blyttia : Norsk botanisk forenings tidsskrift 1982; Volum 40 (2). ISSN 0006-5269.s 134 - 135.