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Lepraria nylanderiana Kümmerl. & Leuckert |
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Nomenclatural data
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Biblioth. Lichenol. 58: 250 (1995); type: Italy, Sardinia, Nuoro Province, Catena del Marghine, 18. Jul. 1987, H. Kümmerling (B—holotypus).
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Morphology
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Thallus crustose, leprose, with cottony to powdery, sometimes membranous appearance; whitish grey to cream; thick, soft, loosely attached to the substrate; shape irregular, up to several cm in diam.; margin delimited, minute lobes present in well developed specimens, without raised rims; cortex absent; medulla usually present, whitish; conspicuous greyish hypothallus present in well developed specimens; areoles absent; squamules absent; thallus surfaces without soredia often present, medulla exposed in places, soredia abundant, medium to coarse, up to 300 µm in diam., relatively loosely packed; projecting hyphae usually present, short; isidia-like structures absent. Photobiont green, coccoid, 7-15 mm.
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Chemistry
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Thamnolic acid, decarboxythamnolic acid (trace), roccellic acid, rarely atranorin (trace). K+ lemon yellow, C–, KC–, Pd+ orange-yellow.
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Remarks
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L. nylanderiana has similar morphology to L. nivalis by definition (Leuckert et al. 1995), but it contains thamnolic acid and often has greyish hypothallus. Species producing thamnolic acid include L. aurescens, L. nylanderiana, L. pulchra, L. umbricola, see the discussion under L. aurescens. Sometimes L. leprolomopsis, L. eburnea, L. diffusa, L. lobificans and L. vouauxii may be morphologically similar to L. nylanderiana, see the discussion under L. leprolomopsis.
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Ecology and distribution
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Substrate and ecology: soil, mosses, siliceous rocks, sometimes bark. Distribution: Mediterranean area, Central Europe.
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