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Lepraria multiacida Aptroot |
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Nomenclatural data
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Fungal Divers. 9: 20 (2002); type: Brazil, Minas Gerais, Catas Altas, Serra do Caraça, Parque Natural do Caraça, 15-21, Sept. 1997, A. Aptroot 40640 a 40 (SP—holotypus, ABL—isotypus).
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Morphology
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Thallus crustose, leprose, with granular appearance; creamy white; thick to very thick, up to 2 mm, attached to the substrate; shape mostly irregular, up to several cm in diam.; margin delimited, minute lobes often present, up to 0.5 mm wide, thinner than the rest of the thallus, up to 0.2 mm thick, without raised rims; cortex absent; medulla present, distinct, white, sometimes blackened; sometimes medullary hyphae also form hypothallus, white to often black; areoles absent; squamules absent; soredia abundant, coarse, c. 100-200 µm in diam., irregular; projecting hyphae present, long, up to 100 µm; isidia-like structures absent. Photobiont chlorococcoid.
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Chemistry
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Atranorin; usually zeorin together with 1-2 unknown terpenoids; constictic acid (major to minor); stictic, cryptostictic, norstictic acids (all minor to trace); salazinic acid (minor to trace); 3,7-di-O-methylstrepsilin (minor to trace); 7-O-methylstrepsilin, strepsilin, unidentified dibenzofuran (all trace). K+ yellow to orange, C–, KC–.
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Remarks
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L. salazinica produces salazinic acid, like L. multiacida, and can be similar in morphology. However, L. salazinica contains large quantities of salazinic acid and less other substances than L. multiacida. L. crassissima, sometimes L. nivalis, L. squamatica, may be morphologically similar to L. multiacida, but differ in chemistry (see descriptions of these species). Several species can produce stictic acid complex and atranorin, see the discussion under L. caesioalba.
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Ecology and distribution
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Substrate and ecology: sandstone, soil. Distribution: Brazil.
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