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Australian Biological Resources Study

Checklist of the Lichens of Australia and its Island Territories
Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References
Lecanora margaritula Zahlbr.
  in H.Magnusson & A.Zahlbruckner, Ark. Bot. 31A(6): 70 (1944). T: Mauna Kea, Hawaiian Islands, 2000 m alt., A.Faurie 821; holo: W. *****Lecanora arnhemica Lumbsch, J. Hattori Bot. Lab. 77: 68 (1994). T: Donkey Ck, 27 km S of Drysdale River Stn, Kimberleys, W.A., 15 July 1991, H.T.Lumbsch 8811b, J.A.Elix & H.Streimann; holo: CANB; iso: ESS, Herb. H.T.Lumbsch.  
  Thallus thin, dispersed-verrucose to areolate, yellowish white to yellowish grey or whitish grey, epruinose, sometimes glossy. Soredia absent. Prothallus not visible. Apothecia immersed when immature, becoming sessile to slightly constricted at the base, 0.2–0.6 mm diam.; disc pale to dark red-brown, epruinose or slightly whitish-pruinose; margin concolorous with the thallus, thin, entire, ±verrucose to crenulate. Cortex hyaline, ±gelatinous, 15–20 µm thick laterally and 20–25 µm thick basally. Amphithecium with large crystals insoluble in KOH (pulicaris-type). Parathecium hyaline, with numerous small crystals insoluble in KOH, 10–15 µm thick. Epihymenium reddish brown, with crystals, c. 15 µm thick; crystals and pigmentation soluble in KOH (pulicaris-type). Hymenium, subhymenium and hypothecium hyaline. Paraphyses sparingly branched and thickened apically. Ascospores ellipsoidal, 8.5–13.5 × 5.0–6.5 µm. CHEMISTRY: Thallus and apothecial margin K+ yellow → red, C+ pale orange, Pd+ yellowish orange; containing atranorin (major), chloroatranorin (major), norstictic acid (major), thiophanic acid (submajor), 3-O-methylthiophanic acid (minor), connorstictic acid (trace) and arthothelin (trace).
  This saxicolous species occurs on siliceous sandstone and quartzite in monsoonal Eucalyptus woodland and dry-sclerophyll forest in northern W.A. and N.T. and in eastern Qld. It grows on shaded or south-facing rocks. Also known from the Hawaiian Islands.  
  Lumbsch & Elix (2004)  

Checklist Index
Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References

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