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Lepraria santamonicae K. Knudsen & Elix |
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Nomenclatural data
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Bryologist 110(1): 115 (2007); type: U.S.A. California, Los Angeles Co., Los Angeles, Santa Monica Mountains, Griffith Park, 34°09’07”N, 118°18’08”W, 27 Nov 2005, Knudsen 4380 et al. (holotypus—UCR; isotypi—ASU, BM, CANB, H, HERB. LENDEMER, NY).
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Morphology
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Thallus crustose, leprose, with powdery appearance; pale turquoise to dull green or blue-green, granules in uppermost exposed surface sometimes darkened; thin to thick (100-300 µm, sometimes up to 1 mm); shape irregular, contiguous to dispersed in clumps, fused covers up to several meters in diam.; margin diffuse, lobes absent; cortex absent; medulla absent, but sometimes a white pseudo-medullary layer of gelatinized hyphae and necral matter, is present; lower surface absent; areoles present in well developed thalli; squamules absent; thallus surfaces without soredia absent, soredia abundant, fine, 30-50 µm in diam., densely packed; wall present; projecting hyphae absent, but occasionally with thin colourless hyphae acting as anchors or rhizines; some soredia not well separated from each-other; isidia-like structures absent. Photobiont chlorococcoid, usually 7–11 µm in diam.
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Chemistry
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Argopsin, norargopsin (major to minor). K–, C–, KC–, Pd– or Pd+ orange to orange-red.
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Remarks
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L. adhaerens produces the chlorodepsidone pannarin that is biosequentially related to argopsin, but otherwise that species differs chemically and morphologically. L. coriensis may contain argopsin like L. santamonicae but it has medulla and lobes, contains usnic acid.
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Ecology and distribution
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Substrate and ecology: rock or soil, mostly siliceous substrate; open habitats, also those exposed to rain and sunlight, a pioneer species. Distribution: North America (California, USA).
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