Kaasalainen U, Kirika PM, Mollel NP, Hemp A, Rikkinen J. 2023. Two new species of Leptogium (Collemataceae) with transversely septate ascospores from East Africa. Folia Cryptogamica Estonica 60: 57–64, doi.org/10.12697/fce.2023.60.08.
Jüriado I, Kaasalainen U, Liira J, Rikkinen J. 2023. Peltigera (Ascomycota) living in open and shady environments depend on different Nostoc photobionts. Folia Cryptogamica Estonica 60: 75–99, doi.org/10.12697/fce.2023.60.10.
Kaasalainen U, Kirika PM, Mollel NP, Hemp A, Rikkinen J. 2023. The lichen genus Sticta (Lobariaceae, Peltigerales) in East African montane ecosystems. Journal of Fungi 9: 246, doi.org/10.3390/jof9020246.
Kaasalainen U, Biermann L, Mollel NP, Schmidt AR, Hemp A. 2022. Peltigera (Lecanoromycetes) on Mt. Kilimanjaro, East Africa. The Lichenologist 54: 231–234, doi.org/10.1017/S0024282922000184.
Schmidt AR, Steuernagel L, Behling H, Seyfullah LJ, Beimforde C, Sadowski E, Rikkinen J, Kaasalainen U. 2022. Fossil evidence of lichen grazing from Palaeogene amber. Review of Palaeobotany and Palynology 302: 104664, doi.org/10.1016/j.revpalbo.2022.104664.
Kaasalainen U, Tuovinen V, Mwachala G, Pellikka P, Rikkinen J. 2021. Complex interaction networks among cyanolichens of a tropical biodiversity hotspot. Frontiers in Microbiology 12: 672333, doi.org/10.3389/fmicb.2021.672333.
Bouju V, Feldberg K, Kaasalainen U, Schaefer-Verwimp A, Hedenäs L, Buck W, Wang B, Perrichot V, Schmidt AR. 2021. Miocene Ethiopian amber: a new source of fossil cryptogams. Journal of Systematics and Evolution 60: 932–954, doi.org/10.1111/jse.12796.
Johansson NR, Kaasalainen U, Rikkinen J. 2021. Woodpeckers can act as dispersal vectors for fungi, plants, and microorganisms. Ecology and Evolution 11: 7154–7163, doi.org/10.1002/ece3.7648.
Kaasalainen U, Tuovinen V, Kirika PM, Mollel NP, Hemp A, Rikkinen J. 2021. Diversity of Leptogium (Collemataceae, Ascomycota) in East African Montane Ecosystems. Microorganisms 9: 314, doi.org/10.3390/microorganisms9020314.
Kaasalainen U, Rikkinen J, Schmidt AR. 2020. Fossil Usnea and similar fruticose lichens from Palaeogene amber. The Lichenologist 52: 319–324, doi.org/10.1017/S0024282920000286.
Stam Å, He X, Kaasalainen U, Toivonen M, Enroth J, Räsänen M, Rikkinen J. 2020. Epiphyte colonisation of fog nets in montane forests of the Taita Hills, Kenya. Annales Botanici Fennici 57: 227–238, doi.org/10.5735/085.057.0406.
Kaasalainen U. 2019. Afrikan Kilimanjarovuori ja sen jäkälät. Luonnon Tutkija 123: 40–48.
Kaasalainen U, Kukwa M, Rikkinen J, Schmidt AR. 2019. Crustose lichens with lichenicolous fungi from Paleogene amber. Scientific Reports 9: 10360, doi.org/10.1038/s41598-019-46692-w.
Jüriado I, Kaasalainen U, Jylhä M, Rikkinen J. 2019. Relationships between mycobiont identity, photobiont specificity and ecological preferences in the lichen genus Peltigera (Ascomycota) in Estonia (northeastern Europe). Fungal Ecology 39: 45–54, doi.org/10.1016/j.funeco.2018.11.005.
Suija A, Kaasalainen U, Kirika P, Rikkinen J. 2018. Taitaia, a novel lichenicolous fungus in tropical montane forests in Kenya (East-Africa). The Lichenologist 50: 173–184, doi.org/10.1017/s0024282918000026.
Kaasalainen U, Schmidt AR, Rikkinen J. 2017. Diversity and ecological adaptations in Palaeogene lichens. Nature Plants 3: 17049, doi.org/10.1038/nplants.2017.49.
Jüriado I, Kaasalainen U, Rikkinen J. 2017. Specialist taxa restricted to threatened habitats contribute significantly to the regional diversity of Peltigera (Lecanoromycetes, Ascomycota) in Estonia. Fungal Ecology 30: 76–87, doi.org/10.1016/j.funeco.2017.08.004.
Kaasalainen U, Heinrichs J, Renner MAM, Hedenäs L, Schäfer-Verwimp A, Lee GE, Ignatov MS, Rikkinen J, Schmidt AR. 2017. A Caribbean epiphyte community preserved in Miocene Dominican amber. Earth and Environmental Science Transactions of The Royal Society of Edinburgh 107: 321–331, doi.org/10.1017/S175569101700010X.
Hartl C, Schmidt AR, Heinrichs J, Seyfullah LJ, Schäfer N, Gröhn C, Rikkinen J, Kaasalainen U. 2015 Lichen preservation in amber: morphology, ultrastructure, chemofossils, and taphonomic alteration. Fossil Record 18: 127–135, doi.org/10.5194/fr-18-127-2015.
Kaasalainen U, Olsson S, Rikkinen J. 2015. Evolution of the tRNALeu (UAA) intron and congruence of genetic markers in lichen-symbiotic Nostoc. PLoS ONE 10: e0131223, doi.org/10.1371/journal.pone.0131223.
Kaasalainen U, Heinrichs J, Krings M, Myllys L, Grabenhorst H, Rikkinen J, Schmidt AR. 2015. Alectorioid morphologies in Paleogene lichens: new evidence and re-evaluation of the fossil Alectoria succini Mägdefrau. PLoS ONE 10: e0129526, doi.org/10.1371/journal.pone.0129526.
Fedrowitz K, Frisch A, Kaasalainen U, Ohmura Y. 2014. Nephroma squamigerum (Nephromataceae, lichenized Ascomycota) is a distinct species. Journal of Japanese Botany 89: 346–354 (pdf).
Shishido TK, Kaasalainen U, Fewer DP, Rouhiainen L, Jokela J, Wahlsten M, Yunes JS, Fiore MF, Rikkinen J, Sivonen K. 2013. Convergent evolution of [D-Leucine1] microcystin-LR in taxonomically disparate cyanobacteria. BMC Evolutionary Biology 13: 86, doi.org/10.1186/1471-2148-13-86.
Fewer DP, Wahlsten M, Österholm J, Rouhiainen L, Jokela J, Kaasalainen U, Rikkinen J, Sivonen K. 2013. The genetic basis for O-acetylation of the microcystin toxin in cyanobacteria. Chemistry & Biology 20: 861–869, doi.org/10.1016/j.chembiol.2013.04.020.
Kaasalainen U, Fewer DP, Jokela J, Wahlsten M, Sivonen K, Rikkinen J. 2013. Lichen species identity and diversity of cyanobacterial toxins in symbiosis. New Phytologist 198: 647–651, doi.org/10.1111/nph.12215.
Kaasalainen U, Fewer DP, Jokela J, Wahlsten M, Sivonen K, Rikkinen J. 2012. Cyanobacteria produce a high variety of hepatotoxic peptides in symbiosis. Proceedings of the National Academy of Sciences of the United States of America 109: 5886–5891, doi.org/10.1073/pnas.1200279109.
Olsson S, Kaasalainen U, Rikkinen J. 2012. Reconstruction of structural evolution in the trnL intron P6b loop of symbiotic Nostoc (Cyanobacteria). Current Genetics 58: 49–58, doi.org/10.1007/s00294-011-0364-0.
Fedrowitz K, Kaasalainen U, Rikkinen J. 2012. Geographic mosaic of symbiont selectivity in a genus of epiphytic cyanolichens. Ecology and Evolution 2: 2291–2303, doi.org/10.1002/ece3.343.
Fedrowitz K, Kaasalainen U, Rikkinen J. 2011. Genotype variability of Nostoc symbionts in three epiphytic Nephroma species in a boreal forest landscape. Bryologist 114: 220–230, doi.org/10.1639/0007-2745-114.1.220.
Kaasalainen U, Jokela J, Fewer DP, Sivonen K, Rikkinen J. 2009. Microcystin production in the tripartite cyanolichen Peltigera leucophlebia. Molecular Plant-Microbe Interactions 22: 695–702, doi.org/10.1094/MPMI-22-6-0695.