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Lepraria sylvicola Orange |
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Nomenclatural data
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Lichenologist 38(6): 507 (2006); type: Great Britain, Scotland, Westerness (V.C. 97), near Fort William, Loch Linnhe, 27/0507.6724, 15 May 2004, A. Orange 15013 (NMW—holotypus; BG, PRA—isotypi; GenBank accession no. DQ401102).
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Morphology
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Thallus crustose, leprose, with powdery appearance; bluish white to greenish white to pale blue-grey; thin to thick, relatively soft, not very firmly attached to the substrate; shape usually irregular; margin diffuse or delimited, lobes absent or obscure and poorly developed; cortex absent; true medulla absent but hypothallus may look like medulla; hypothallus of sparse patches of hyphae growing into cavities of substratum, hyphae below thallus pale orange-brown (K+ purple-red), lower surface absent; prothallus absent; areoles absent; squamules absent; soredia abundant, fine to coarse, 40-160 µm in diam., loosely packed; projecting hyphae rarely present, short; isidia-like structures absent. Photobiont chlorococcoid.
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Chemistry
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Atranorin, roccellic/angardianic acid, toensbergianic acid, an unknown anthraquinone ± (minor, in subthalline hyphae only). K+ yellowish, C–, Pd– or + yellow.
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Remarks
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According to molecular studies, L. sylvicola is close to but still different from L. jackii (Slavíková-Bayerová & Orange 2006, Fehrer et al. unpublished). Morphologically similar species include L. atlantica, L. celata, L. humida, L. elobata and especially L. jackii, L. neojackii, and L. toensbergiana but all these taxa can be distinguished chemically. Besides L. sylvicola, L. jackii and L. toensbergiana also produce toensbergianic acid. See discussion under L. jackii.
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Ecology and distribution
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Substrate and ecology: neutral to slightly acidic bark, especially abundant on oak, sometimes on rock; more or less sheltered surfaces, especially in mature well-lit woodland. Distribution: British Isles.
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