Ulla Kaasalainen

Publications14
h-index8
Citations160
Highly Influential Citations9
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Genotype variability of Nostoc symbionts associated with three epiphytic Nephroma species in a boreal forest landscape
Abstract We studied lichen photobiont diversity patterns of three epiphytic Nephroma species in a 900-ha boreal forest landscape using cyanobacterial tRNALeu (UAA) intron sequences. Our aim was to… Expand
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Geographic mosaic of symbiont selectivity in a genus of epiphytic cyanolichens
In symbiotic systems, patterns of symbiont diversity and selectivity are crucial for the understanding of fundamental ecological processes such as dispersal and establishment. The lichen genus… Expand
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Diversity and ecological adaptations in Palaeogene lichens
Lichens are highly specialized symbioses between heterotrophic fungi and photoautotrophic green algae or cyanobacteria. The mycobionts of many lichens produce morphologically complex thalli to house… Expand
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A Caribbean epiphyte community preserved in Miocene Dominican amber
Fossil tree resins preserve a wide range of animals, plants, fungi and microorganisms in microscopic fidelity. Fossil organisms preserved in an individual piece of amber lived at the same time in… Expand
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Reconstruction of structural evolution in the trnL intron P6b loop of symbiotic Nostoc (Cyanobacteria)
In this study we reconstruct the structural evolution of the hyper-variable P6b region of the group I trnLeu intron in a monophyletic group of lichen-symbiotic Nostoc strains and establish it as a… Expand
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Alectorioid Morphologies in Paleogene Lichens: New Evidence and Re-Evaluation of the Fossil Alectoria succini Mägdefrau
One of the most important issues in molecular dating studies concerns the incorporation of reliable fossil taxa into the phylogenies reconstructed from DNA sequence variation in extant taxa. Lichens… Expand
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Lichen preservation in amber: morphology, ultrastructure, chemofossils, and taphonomic alteration
Abstract. The fossil record of lichens is scarce and many putative fossil lichens do not show an actual physiological relationship between mycobionts and photobionts or a typical habit, and are… Expand
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Taitaia, a novel lichenicolous fungus in tropical montane forests in Kenya (East Africa)
During lichenological explorations of tropical montane forests in Kenya, a remarkable new lichenicolous fungus was repeatedly found growing on thalli of the epiphytic tripartite cyanolichen Crocodia… Expand
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Evolution of the tRNALeu (UAA) Intron and Congruence of Genetic Markers in Lichen-Symbiotic Nostoc
The group I intron interrupting the tRNALeu UAA gene (trnL) is present in most cyanobacterial genomes as well as in the plastids of many eukaryotic algae and all green plants. In lichen symbiotic… Expand
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Crustose lichens with lichenicolous fungi from Paleogene amber
Lichens, symbiotic consortia of lichen-forming fungi and their photosynthetic partners have long had an extremely poor fossil record. However, recently over 150 new lichens were identified from… Expand
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