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| 2. |
- Arup, Ulf, et al.
(författare)
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Caloplaca erecta, a new subfruticose species from New Zealand
- 2000
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Ingår i: Lichenologist. - : Cambridge University Press (CUP). - 0024-2829. ; 32:4, s. 359-363
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Tidskriftsartikel (refereegranskat)abstract
- Caloplaca erecta Arup & H. Mayrhofer is described here as new to science. It belongs to a group of dwarf-fruticose species, but cannot be accommodated within any of the known species of that group. It forms dense cushions of erect lobes on siliceous rocks, and is known only from Mt. Maungatua. This is the second dwarf-fruticose species of Caloplaca in the Australasian area, in addition to C. cribosa. (C) 2000 The British Lichen Society.
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| 3. |
- Arup, Ulf, et al.
(författare)
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High performance thin layer chromatography (HPTLC), an improved technique for screening lichen substances.
- 1993
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Ingår i: The Lichenologist. - : Cambridge University Press (CUP). - 0024-2829 .- 1096-1135. ; 25, s. 61-71
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Tidskriftsartikel (refereegranskat)abstract
- High performance thin layer chromatography (HPTLC) is a method that can be used for screening lichen substances. It is as simple to use as standard TLC, but has many advantages: It is more sensitive, it is possible to run more samples in a shorter period of time, and the amount of solvent used is much smaller. The material needed and the methods used are described in detail. Horizontal chromatogram development was used. Since two of the solvents used in system B have been substituted, and since the properties of the HPTLC plates are slightly different, our results are not entirely in accordance with the standardized TLC method. A revised table for the identification of 69 lichen substances (obtained from 62 taxa) is accordingly presented.
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| 4. |
- Arup, Ulf, et al.
(författare)
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Professor Ingvar Kärnfelt - a birthday tribute
- 2009
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Ingår i: The Lichenologist. - Cambridge : Cambridge University Press. - 0024-2829 .- 1096-1135. ; 41:5, s. 453-456
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- On 19 July 2009 Ingvar Kärnefelt celebrated his 65th birthday. This could have meant that we, his former students, would be celebrating him in his retirement from his position as head of the Biological Museums at Lund University. We are grateful that this is not the case, as Ingvar will carry on, probably for at least one or two more years. Instead, we celebrate Ingvar because he is the main reason for all of us having studied lichenology in Lund. This special issue of The Lichenologist is dedicated to him as a birthday tribute in honour of his long and fruitful lichenological career. The main authors of all the papers in this issue are former students of Ingvar. For several of us he has not only acted as supervisor but later also as the director of the Botanical Museum where we meet him in our daily work.
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| 5. |
- Asplund, Johan, et al.
(författare)
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Changes in functional traits of the terricolous lichen Peltigera aphthosa across a retrogressive boreal forest chronosequence
- 2015
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Ingår i: Lichenologist. - 0024-2829 .- 1096-1135. ; 47, s. 187-195
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Tidskriftsartikel (refereegranskat)abstract
- Changes in the functional traits of the terricolous lichen Peltigera aphthosa with declining soil fertility during ecosystem retrogression were investigated. A well-documented retrogressive chronosequence of 28 forested islands in northern Sweden that differ greatly in fire history and which spans 5000 years was used. The abundance of cephalodia increased, indicative of higher N-2-fixation rates resulting from lower N availability. Thallus C-13 values increased with ageing soils, in line with declining C-13 values of the humus substratum along this gradient. However, C-13 values were also driven by variation in factors that were at least partly independent of soil ageing. As such, C-13 values were mostly related to specific thallus mass (STM), possibly because a higher STM gives a thicker cortical layer and thus greater resistance to CO2 diffusion, leading to higher C-13 values. STM and other measured traits (i.e. thallus N, P, secondary compounds and water-holding capacity) were unresponsive to the gradient, despite these traits being very responsive to the same gradient in epiphytic lichen species.
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| 6. |
- Asplund, Johan, et al.
(författare)
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Simulated global warming increases usnic acid but reduces perlatolic acid in the mat-forming terricolous lichen Cladonia stellaris
- 2017
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Ingår i: Lichenologist. - 0024-2829 .- 1096-1135. ; 49, s. 269-274
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Tidskriftsartikel (refereegranskat)abstract
- Lichens as sessile and slow-growing symbiotic associations have evolved various carbon-based secondary compounds (CBSCs) to mitigate the effects of some stressors in the extreme environments in which they often grow. The mat-forming lichen Cladonia stellaris, an important fodder for reindeer, produces usnic acid in the outermost layer and perlatolic acid in the medulla. Here, we studied effects of simulated global warming on these CBSCs in C. stellaris cultivated in climate chambers with: 1) ambient conditions as control or 2) ambient conditions +4 degrees C. The chambers simulated, at an hourly resolution, an averaged 10-year growing season dynamic from a long-term monitored boreal mire in northern Sweden. After two months of acclimation, +4 degrees C warming in one simulated growing season increased the concentration of usnic acid by 31% compared with ambient conditions, whereas the warming decreased the concentration of perlatolic acid by 14%. Since lichen CBSCs play important roles in ecosystem processes such as lichenivory and decomposition, these changes may profoundly affect lichen-dominated ecosystems.
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| 7. |
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| 8. |
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| 9. |
- Brännström, Ioana Onut, et al.
(författare)
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Thamnolia tundrae sp nov., a cryptic species and putative glacial relict
- 2018
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Ingår i: The Lichenologist. - : Cambridge University Press. - 0024-2829 .- 1096-1135. ; 50:1, s. 59-75
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Tidskriftsartikel (refereegranskat)abstract
- The lichen species of the genus Thamnolia, with their striking wormlike thalli and frequent occurrence in arctic and tundra environments, have often been debated with regard to the use of chemistry in lichen taxonomy. Phylogenetic studies have arrived at different conclusions as to the recognition of species in the genus, but in a recent study based on the analyses of six nuclear markers (genes or noncoding regions) of a worldwide sample of Thamnolia, we showed the existence of three well-supported lineages with two different chemistries and geographical distributions. Here, we present two analyses based on ITS and three markers, respectively, which were extended from the study mentioned above to include type specimens and additional Thamnolia strains and taxa. In these analyses the same three clades were retrieved. A putative DEAD-box helicase is used here for the first time as an informative phylogenetic marker to provide taxonomic resolution at species level. The distribution of morphological and chemical characters across the phylogeny was analyzed and it was concluded that three morphologically cryptic, but genetically well supported, species occur: T. vermicularis s. str., T. subuliformis s. str. and T. tundrae sp. nov. Thamnolia vermicularis s. str. contains individuals with uniform secondary chemistry (producing thamnolic acid) and a rather limited distribution in the European Alps, Tatra Mts and the Western Carpathians, a distribution which might result from glacial survival in an adjacent refugium/refugia. Thamnolia subuliformis s. str. is widely distributed in all hemispheres and the samples contain two chemotypes (either with thamnolic or squamatic acids). Thamnolia tundrae is described as new; it produces baeomycesic and squamatic acids, and has a distribution limited to the arctic tundra of Eurasia extending to the Aleutian Islands in North America. It may have survived the latest glaciation in coastal refugia near its present distribution. Thus, secondary chemistry alone is not suitable for characterizing species in Thamnolia, secondary chemistry and geographical origin are informative, and the ITS region can be confidently used for species recognition. Nomenclatural notes are given on several other names that have been used in Thamnolia.
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| 10. |
- Ekman, Stefan, 1965-
(författare)
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Bacidia rosellizans, a new lichen species from the taiga belt
- 2009
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Ingår i: The Lichenologist. - 0024-2829 .- 1096-1135. ; 41:Part 5, s. 481-487
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Tidskriftsartikel (refereegranskat)abstract
- Bacidia rosellizans S. Ekman is described as new to science. Morphologically, the newspecies is similar to the type species of the genus, B. rosella (Pers.) De Not., particularly in the pale pinkand pigment-deficient apothecia and in having the proper exciple and upper part of the hymeniuminspersed with minute crystals that consist at least partly of atranorin. Bacidia rosellizans, however,differs in having a thin whitish thallus, smaller apothecia and a thinner apothecial margin, a dense layerof crystals along the excipular rim, shorter and narrower ascospores with fewer septa, and septateconidia. Whereas B. rosella is a species occurring in the nemoral zone of Europe and possiblynorthernmost Africa and parts of Asia (but not North America), B. rosellizans is found mainly onPopulus and Salix in taiga. This species is currently known from Sweden, Russia, Canada and the USA.It was erroneously treated as Bacidia rosella in a monograph of North American corticolous species ofBacidia and Bacidina by Ekman (in Opera Botanica 127, 1996).
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