Ulla Kaasalainen

Most-cited papers

1. Cyanobacteria produce a high variety of hepatotoxic peptides in lichen symbiosis

   Ulla Kaasalainen, D. Fewer, J. Jokela, M. Wahlsten +2 more

   2012Proceedings of the National Academy of Sciences of the United States of America161 citations Open access

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2. Microcystin production in the tripartite cyanolichen Peltigera leucophlebia.

   Ulla Kaasalainen, J. Jokela, D. Fewer, K. Sivonen +1 more

   2009Molecular Plant-Microbe Interactions52 citations Open access

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3. Genotype variability of Nostoc symbionts associated with three epiphytic Nephroma species in a boreal forest landscape

   Katja Fedrowitz, Ulla Kaasalainen, J. Rikkinen

   201147 citations

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4. Diversity and ecological adaptations in Palaeogene lichens

   Ulla Kaasalainen, A. Schmidt, J. Rikkinen

   2017Nature Plants44 citations Open access

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5. Alectorioid Morphologies in Paleogene Lichens: New Evidence and Re-Evaluation of the Fossil Alectoria succini Mägdefrau

   Ulla Kaasalainen, J. Heinrichs, M. Krings, L. Myllys +3 more

   2015PLoS ONE39 citations Open access

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6. Geographic mosaic of symbiont selectivity in a genus of epiphytic cyanolichens

   Katja Fedrowitz, Ulla Kaasalainen, J. Rikkinen

   2012Ecology and Evolution35 citations Open access

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7. Convergent evolution of [D-Leucine1] microcystin-LR in taxonomically disparate cyanobacteria

   T. K. Shishido, Ulla Kaasalainen, D. Fewer, L. Rouhiainen +6 more

   2013BMC Evolutionary Biology33 citations Open access

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8. Relationships between mycobiont identity, photobiont specificity and ecological preferences in the lichen genus Peltigera (Ascomycota) in Estonia (northeastern Europe)

   I. Jüriado, Ulla Kaasalainen, M. Jylhä, J. Rikkinen

   2019Fungal ecology32 citations Open access

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9. Lichen preservation in amber: morphology, ultrastructure, chemofossils, and taphonomic alteration

   C. Hartl, A. Schmidt, J. Heinrichs, L. Seyfullah +4 more

   201527 citations Open access

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10. Woodpeckers can act as dispersal vectors for fungi, plants, and microorganisms

    Niko R. Johansson, Ulla Kaasalainen, J. Rikkinen

    2021Ecology and Evolution25 citations Open access

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11. The genetic basis for O-acetylation of the microcystin toxin in cyanobacteria.

    D. Fewer, M. Wahlsten, Julia Österholm, J. Jokela +4 more

    2013Chemistry and Biology25 citations Open access

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12. Lichen species identity and diversity of cyanobacterial toxins in symbiosis.

    Ulla Kaasalainen, D. Fewer, J. Jokela, M. Wahlsten +2 more

    2013New Phytologist24 citations Open access

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13. Complex Interaction Networks Among Cyanolichens of a Tropical Biodiversity Hotspot

    Ulla Kaasalainen, Veera Tuovinen, G. Mwachala, P. Pellikka +1 more

    2021Frontiers in Microbiology21 citations Open access

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14. A Caribbean epiphyte community preserved in Miocene Dominican amber

    Ulla Kaasalainen, J. Heinrichs, M. Renner, L. Hedenäs +5 more

    2016Earth and environmental science transactions of the Royal Society of Edinburgh21 citations Open access

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15. Taitaia, a novel lichenicolous fungus in tropical montane forests in Kenya (East Africa)

    A. Suija, Ulla Kaasalainen, P. Kirika, J. Rikkinen

    2018The Lichenologist19 citations Open access

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16. Reconstruction of structural evolution in the trnL intron P6b loop of symbiotic Nostoc (Cyanobacteria)

    Sanna Olsson, Ulla Kaasalainen, J. Rikkinen

    2011Current Genetics19 citations

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17. Specialist taxa restricted to threatened habitats contribute significantly to the regional diversity of Peltigera (Lecanoromycetes, Ascomycota) in Estonia

    I. Jüriado, Ulla Kaasalainen, J. Rikkinen

    201718 citations Open access

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18. Miocene Ethiopian amber: A new source of fossil cryptogams

    Valentine Bouju, K. Feldberg, Ulla Kaasalainen, A. Schäfer-Verwimp +5 more

    2021Journal of Systematics and Evolution17 citations Open access

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19. Evolution of the tRNALeu (UAA) Intron and Congruence of Genetic Markers in Lichen-Symbiotic Nostoc

    Ulla Kaasalainen, Sanna Olsson, J. Rikkinen

    2015PLoS ONE15 citations Open access

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20. Crustose lichens with lichenicolous fungi from Paleogene amber

    Ulla Kaasalainen, M. Kukwa, J. Rikkinen, A. Schmidt

    2019Scientific Reports13 citations Open access

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21. Diversity of Leptogium (Collemataceae, Ascomycota) in East African Montane Ecosystems

    Ulla Kaasalainen, Veera Tuovinen, P. Kirika, N. Mollel +2 more

    2021Microorganisms9 citations Open access

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22. Diversity of fungi attached to birds corresponds to the habitat ecologies of their avian dispersal vectors

    Niko R. Johansson, Ulla Kaasalainen, J. Rikkinen

    2025Annals of Botany7 citations Open access

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23. The Lichen Genus Sticta (Lobariaceae, Peltigerales) in East African Montane Ecosystems

    Ulla Kaasalainen, P. Kirika, N. Mollel, A. Hemp +1 more

    2023Journal of Fungi7 citations Open access

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24. Fossil Usnea and similar fruticose lichens from Palaeogene amber

    Ulla Kaasalainen, J. Rikkinen, A. Schmidt

    2020The Lichenologist7 citations Open access

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25. Peltigera (Lecanoromycetes) on Mt Kilimanjaro, East Africa

    Ulla Kaasalainen, L. Biermann, N. Mollel, A. Schmidt +1 more

    2022The Lichenologist4 citations Open access

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26. Extending the fossil record of Miocene neotropical epiphyte communities

    K. Feldberg, Ulla Kaasalainen, Y. Mamontov, S. R. Gradstein +3 more

    2025Fossil Record3 citations Open access

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27. A botanical view of the ‘Baltic amber forest’: new evidence from seed plants, lichens and fungi

    A. Schmidt, Eva-Maria Sadowski, Ulla Kaasalainen, J. Rikkinen

    20193 citations

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28. Epiphyte Colonisation of Fog Nets in Montane Forests of the Taita Hills, Kenya

    Åsa Stam, Xiao-Lan He, Ulla Kaasalainen, M. Toivonen +3 more

    2020Annales Botanici Fennici2 citations

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29. Fossil evidence of lichen grazing from Paleogene amber

    A. Schmidt, Lukas Steuernagel, H. Behling, L. Seyfullah +4 more

    2022Review of Palaeobotany and Palynology1 citations Open access

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30. Lichen diversity on Mt. Kilimanjaro

    Ulla Kaasalainen, A. Hemp, J. Rikkinen

    20181 citations

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31. Cyanobacteria and their toxins in lichen symbiosis

    Ulla Kaasalainen

    20121 citations

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32. Two new species of Leptogium (Collemataceae) with transversely septate ascospores from East Africa

    Ulla Kaasalainen, P. Kirika, N. Mollel, Andreas Hemp +1 more

    2023Folia Cryptogamica Estonica0 citations Open access

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33. Peltigera (Ascomycota) living in open and shady environments depend on different Nostoc photobionts

    I. Jüriado, Ulla Kaasalainen, J. Liira, J. Rikkinen

    2023Folia Cryptogamica Estonica0 citations Open access

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34. Symbionts and changing environment: Lichen diversity and photobiont associations in tropical mountain ecosystems

    Ulla Kaasalainen, A. Hemp, N. Mollel, J. Rikkinen

    20170 citations

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35. コモチウラミゴケ(ウラミゴケ科,地衣化子嚢菌)は独立種である

    Katja Fedrowitz, Andreas Frisch, Ulla Kaasalainen

    20140 citations

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