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Lepraria toensbergiana Bayerová & Kukwa |
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Nomenclatural data
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Bryologist 108(1): 132 (2005); type: Poland, Western Carpathians, Eastern Tatra Mts, Dolina Roztoki Valley, near Nowa Roztoka, 21. Aug. 1999, W. Fałtynowicz, s.n. (UGDA—holotypus; herb. Š. Bayerová—isotypus).
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Morphology
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Thallus crustose, leprose, with powdery appearance; yellowish white, whitish yellow or greenish grey; thin to thick, relatively soft, not very firmly attached to the substrate; shape usually irregular; margin diffuse or delimited, lobes absent; cortex absent; true medulla absent but hypothallus may look like medulla; hypothallus sparse (abundant in epibryotic specimens) patches of hyphae growing into cavities of substratum, hyphae below thallus usually sparse, white, lower surface absent; prothallus absent; areoles absent; squamules absent; soredia abundant, fine to medium, up to 50(-110) µm in diam., relatively densely packed; wall present, incomplete to complete; projecting hyphae rarely present, short; consoredia sometimes present, up to 110 µm in diam., round; isidia-like structures absent. Photobiont chlorococcoid.
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Chemistry
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Atranorin, toensbergianic acid. Sometimes minor amounts of rangiformic/jackinic and roccellic/angardianic acids have also been detected but were interpreted as contaminations by Bayerová et al. (2005). K+ pale yellow, C–, Pd–.
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Remarks
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According to molecular studies, L. toensbergiana is very close to but still different from L. jackii (Slavíková-Bayerová & Orange 2006, Fehrer et al. unpublished, disputed by Baruffo et al. 2006). Morphologically similar species include L. atlantica, L. celata, L. humida, L. elobata and especially L. jackii, L. neojackii, and L. sylvicola but all these taxa can be distinguished chemically. Besides L. toensbergiana, L. jackii and L. sylvicola also can produce toensbergianic acid. See discussion under L. jackii.
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Ecology and distribution
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Substrate and ecology: bark of coniferous and deciduous trees, mosses, debris, humus, siliceous rocks; mostly acidic substrata, more or less sheltered surfaces. Distribution: Central Europe.
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