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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
Lepraria caesioalba (de Lesd.) J.R.Laundon

Lichenologist 24: 324 (1992)

Crocynia caesioalba de Lesd., Bull. Soc. Bot. France 61: 84 (1914).

T: Forêt de Fontainebleau, Seine-et-Marne, France, very common on mosses and lichens on sandstone rocks, July 1913, M.Bouly de Lesdain; holo: E n.v.

  Thalluscrustose, usually completely leprose, whitish grey to bluish grey, forming ±regular rosettes to 1 cm wide when young, later these sometimes coalescing and forming irregular patches to several centimetres wide, firmly attached to the substratum. Margin delimited or not, not forming true lobes, but frequently with obscure sublobes (as the soredia are often clustered towards the margin) that are often marginally reflexed, covered with coarse granules (to 200 μm wide). Soredia variously sized, coarse, usually compact, often pruinose, to 150–200 μm diam., sometimes largest along the thallus margin, occasionally marginal soredia with projecting hyphae to 0.2 mm long. Medulla absent, but sometimes the thallus with white patches containing masses of crystals superficially resembling a medulla in thicker parts. Hyphae 2–5 μm thick. Lower surface not apparent, without a distinct tomentum. Photobiont cells ±spherical, 8–17 μm diam. Hypothallus absent.
CHEMISTRY: Thallus K+ yellow, C–, KC–, P+ yellow; UV–; containing atranorin (major), angardianic acid and/or roccellic acid (major) [chemical race III of Tønsberg (2004)]
  This rare species is known from the A.C.T. where it grows on soil over subalpine rocks; also in Europe and North and South America.  
  Elix (2009i)  

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