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Lepraria pallida Sipman |
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Nomenclatural data
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Herzogia 17: 33 (2004); type: Brazil, Minas Gerais, Munip. Catas Altas, Serra do Caraça, 20. Sept. 1997, H. Sipman 40945 (B—holotypus, SP—isotypus).
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Morphology
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Thallus crustose, leprose, with granular (but not L. neglecta type) partly membranous appearance; pale grey with slight bluish tinge; thin, c. 0.1 mm, relatively soft to relatively hard, tightly attached to the substrate at centre, sometimes loose at margins attached to the substrate; shape irregular, continuous, up to several cm in diam.; margin delimited to diffuse in places, lobes present in places, often well developed, 0.5-2 mm wide and long, with raised marginal rim, sometimes poorly developed; cortex absent; medulla present, thin, white; hypothallus sometimes well developed, tomentose, grey to black; areoles absent; squamules absent; soredia sometimes not well separated from each-other, forming smoother surface towards margin; abundant, medium, c. 0.1 mm in diam., relatively densely packed; isidia-like structures absent. Photobiont green, coccoid, cells c. 10-12 µm in diam.
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Chemistry
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Atranorin, zeorin, unidentified fatty acids, unidentified terpenoids ±, unidentified substances ± (traces). K+ pale yellow, C–, KC–, Pd+ yellow to orange.
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Remarks
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L. atrotomentosa and L. impossibilis are similar to L. pallida in morphology. Still, L. pallida is more granular and harder; L. atrotomentosa produces lecanoric acid and L. impossibilis dibenzofuranes. L. lobata also produces atranorin, zeorin and fatty acids, lobes. L. pallida has more membranous and rough appearance, well developed ±dark hypothallus and thin medulla, contains unidentified fatty acids, L. lobata has slightly thicker thallus with thicker medulla, is more green in colour and has finer individual soredia and larger consoredia, produces roccellic or rangiformic acid and sometimes small amounts of anthraquinones and unknown dibenzofuranes. However, the characters of these species seem relatively similar.
Several species can develop well developed lobes, see the discussion under L. membranacea. Several species contain atranorin, zeorin and fatty acids as diagnostic substances, see the discussion under L. jackii.
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Ecology and distribution
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Substrate and ecology: bark, sandstone, soil. Distribution: South America, Seyshelles, Madagascar.
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