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Lepraria coriensis (Hue) Sipman |
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Nomenclatural data
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Herzogia 17: 28 (2004); type: South Korea, Cheju-do, Hongno,Oct. 1906, R. P. Faurie 645 (KYO—isotypus). Crocynia coriensis Hue, Bull. Soc. Bot. France 71: 386 (1924).—Lecanora coriensis (Hue) J.R. Laundon, Nova Hedwigia 76: 97 (2003).
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Morphology
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Thallus crustose, leprose, with powdery to membranous appearance; greenish to whitish or yellowish grey; thin to moderately thick, relatively soft, not very firmly attached to the substrate, sometimes partly loose; shape irregular or rosette-forming, often fusing with other thalli, usually up to 10 cm; margin delimited, lobes present, obscure or more often well developed (0.5-2 mm wide) and with raised marginal rim; cortex absent; medulla usually present, thin to medium, white; hypothallus sometimes present, thin, brown to black; areoles absent; squamules absent; sometimes soredia sparse in places, exposing smooth ecorticate surface, especially near margins, soredia abundant to sparse in places, fine to coarse, up to 300 µm in diam., relatively loosely packed; projecting hyphae usually absent; isidia-like structures absent. Photobiont chlorococcoid, up to 13 µm in diam.
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Chemistry
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Three chemotypes were distinguished in a detailed chemical survey by Elix (2006): (1) usnic acid, zeorin, protodehydroconstipatic and constipatic acids (major to minor), isousnic acid ± (minor to trace), atranorin ± (trace); (2) usnic acid, zeorin, protodehydroconstipatic and constipatic acids (minor to trace), argopsin (minor), norargopsin (minor to trace) isousnic acid ± (minor to trace), atranorin ± (minor to trace); (3) usnic acid, zeorin, protodehydroconstipatic and constipatic acids (minor to trace), caloploicin (minor), fulgidin (minor to trace), isousnic acid ± (minor to trace), atranorin ± (trace); the third chemotype was considered rare. Laundon (2003) reported that rarely zeorin can be missing. K–, C–, KC–, Pd–.
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Remarks
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L. sipmaniana can resemble L. coriensis in having well developed lobes with smooth surface and scarce granules, but is more intensely yellow and has different chemistry. Very strongly lobate specimens of L. coriensis may be similar to L. membranacea that is also different chemically, see the discussion under L. membranacea. L. ecorticata, L. straminea, L. texta, L. usnica and L. leuckertiana contain usnic acid and usually zeorin like Lepraria coriensis, but differ in the following aspects. L. ecorticata, L. straminea and L. texta have no lobes and L. straminea has corticate granules; L. leuckertiana is only obscurely and minutely lobed. The lobes of L. usnica are usually small (<0.5 mm), irregular and without marginal rim; that species produces minor amounts of contortin and lacks protodehydroconstipatic and constipatic acids. The chemical differences between L. coriensis and more recent L. usnica were demonstrated by Elix (2006). Some authors have raised the question of the distinctiveness of L. usnica (Orange and Wolseley 2005). L. santamonicae produces argopsin, like L. coriensis, but it has no medulla nor lobes, does not contain usnic acid and argopsin is major secondary substance.
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Ecology and distribution
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Substrate and ecology: rock (mostly siliceous), wood, bark, mosses, soil; shaded and sheltered places. Distribution: Australia, Eastern Asia, India; tropical to subtropical.
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