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Lepraria friabilis Lendemer, K. Knudsen & Elix |
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Nomenclatural data
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Opuscula Philolichenum 5: 64 (2008); type: U.S.A. Alabama, Baldwin Co., Splinter Hill Bog Preserve, 12. Apr. 2007, J. C. Lendemer et al. 9063 (NY—holotype; B, CANB, UCR, UDGA, HERB. LENDEMER—isotypi).
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Morphology
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Thallus crustose, leprose, with powdery appearance; pale bluish to greenish grey or almost white; thin, less than 0.5 mm thick, relatively soft; shape irregular, usually continuous patches form, variable in diam.; margin diffuse, lobes absent; cortex absent; medulla absent; hypothallus present, thin, colourless, not evident, lower surface absent; prothallus not evident, thin, relatively broad, colourless; areoles absent; squamules absent; thallus thallus surfaces without soredia absent, soredia sparse to abundant, very fine, (10-)20–30 µm in diam., relatively densely packed; wall usually distinct; projecting hyphae usually present, short; consoredia present, up to 60 µm; isidia-like structures absent. Photobiont green, coccoid, c. 7-10 µm in diam.
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Chemistry
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This species comprises two chemotypes: (1) fumarprotocetraric acid with minor amounts of protocetraric acid, succinprotocetraric acid and confumarprotocetraric acid; (2) fumarprotocetraric acid only. Both chemotypes K–, C–, KC–, Pd+ orange or red.
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Remarks
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The species that may contain protocetraric and/or fumarprotocetraric acids include L. caesioalba, L. eburnea, L. isidiata, L. lanata, L. nivalis, L. normandinoides, L. squamatica, L. toilenae, see the discussion under L. caesioalba. Morphologically L. friabilis is most similar with L. caesiella, but differs in slightly smaller soredia that are often sparsely distributed on the substrate, forming thinner thallus. L. caesiella produces atranorin and zeorin, while L. friabilis contains fumarprotocetraric acid.
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Ecology and distribution
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Substrate and ecology: bark of conifers; humid habitats. Distribution: southern North America.
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