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Lepraria goughensis Elix & Øvstedal |
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Nomenclatural data
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Mycotaxon 93: 274 (2005); type: Gough Island, Seal Beach, 40°20'S, 9°52'W, 22. Sept. 1999, N. Gremmen 99-701 (BG—holotypus).
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Morphology
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Thallus crustose, leprose, with powdery appearance; grey-green; thin, 0.2-0.3 mm; shape rosette, 1-4 cm in diam.; margin delimited, usually poorly defined lobes present; cortex absent; medulla absent; hypothallus absent, lower surface absent; squamules absent; thallus surfaces without soredia absent, soredia abundant, very fine, 20-26 µm in diam.; projecting hyphae present, numerous; isidia-like structures absent. Photobiont green, coccoid.
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Chemistry
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Lecanoric acid, gyrophoric acid (minor to trace), strepsilin (minor to trace), fragilin (trace), 7-chloroemodin (trace), flavo-obscurin C (trace). K–, C+ red, KC+red, Pd–.
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Remarks
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Chemically similar species that can produce lecanoric acid include L. achariana, L. atrotomentosa, L. impossibilis, L. lecanorica. See the discussion under L. atrotomentosa. L. multiacida, L. xerophila can produce strepsilin and L. bergensis, L. sipmaniana and a chemotype of L. incana contain anthraquinones, but all these taxa differ in both morphology and chemistry (see descriptions of these species).
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Ecology and distribution
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Substrate and ecology: mosses, debris, peat; shaded, humid places. Distribution: Gough Island (South Atlantic).
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