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Lepraria umbricola Tønsberg |
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Nomenclatural data
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Sommerfeltia 14: 206 (1992); type: Norway, Hordaland, Bergen, Milde, Brandaneset, 25. Sept. 1990, T. Tønsberg 13635 (BG—holotypus).
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Morphology
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Thallus crustose, leprose, with powdery appearance; usually deep green, sometimes greyish or whitish; usually thin, rarely thick, relatively hard, firmly attached to the substrate; shape irregular, up to 1 dm in diam.; margin diffuse, lobes absent; cortex absent; medulla very rarely present, thin, white; hypothallus absent; areoles absent; squamules absent; thallus surfaces without soredia absent, soredia abundant to scattered, fine, up to 60 µm in diam., relatively densely packed; wall indistinct to distinct; projecting hyphae rarely present, short; isidia-like structures absent. Photobiont green, coccoid, up to 15 µm in diam.
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Chemistry
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Thamnolic acid, atranorin ±, roccellic/angardianic acid ± (major to trace), decarboxythamnolic acid ± (trace). K+ lemon yellow, C–, KC–, Pd+ orange-yellow.
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Remarks
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L. umbricola may be similar to several powdery, unstratified and green species, e. g. L. ecorticata, but is distinct by producing thamnolic acid. Species producing thamnolic acid include L. aurescens, L. nylanderiana, L. pulchra, L. umbricola. See the discussion under L. aurescens.
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Ecology and distribution
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Substrate and ecology: bark, rock, mosses, soil, mostly acidic substrata; shaded, sheltered, humid, sometimes extremely shaded. Distribution: Europe, Macaronesia.
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