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Lepraria nigrocincta Diederich, Sérus & Aptroot |
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Nomenclatural data
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In Aptroot, Diederich, Sérusiaux, Sipman, Bibl. Lichenol. 64: 78 (1997); type: Burundi, galerie forestière de la Siguvyaye un peu en aval du pont de la route Rumonge-Bururi, 20. Sept. 1974, J. Lambinon 74/1266 (LG—holotypus, herb. Diederich—isotypus).
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Morphology
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Thallus crustose, leprose, with cottony hypothallus and powdery soredia on it; soredia greenish grey to whitish, hypothallus dark brown or whitish; moderately thick, soft, not very firmly attached to the substrate; shape irregular, up to few cm, rarely larger in diam.; margin usually delimited, lobes usually absent, rarely indistinct; cortex absent; medulla absent; hypothallus thick, very lax, blackish brown or whitish, of thick hphae; prothallus absent; areoles absent; squamules absent; well developed lax cottony hypothallus exposed between soredia, soredia scattered, fine, 30-70 µm in diam., relatively loosely packed; projecting hyphae sometimes present if soredial wall poorly developed; consoredia often present, 75-125 µm; isidia-like structures absent. Photobiont green, coccoid, cells 6.5-9 µm in diam.
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Chemistry
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Divaricatic acid, nordivaricatic acid (trace). K–, C– or + pinkish, KC+ pink, Pd–.
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Remarks
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Species producing divaricatic acid include L. crassissima, L. incana and L. nigrocincta, see the discussion under L. crassissima. L. atrotomentosa and L. aurescens also have dark tomentum below the thallus. L. atrotomentosa contains lecanoric acid, L. aurescens produces thamnolic acid and the tomentum is less extensive. L. nigrocincta usually looks different from other Lepraria species because of the very thick, very loose, brownish hypothallus is the dominant part, with a loose cover of scattered soredia.
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Ecology and distribution
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Substrate and ecology: bark and mosses on bark. Distribution: Africa (Burundi), New Guinea, South America (Ecuador, Nöske et al. 2007), montane.
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