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Images of British Lichens

Lecanora swartzii (Ach.) Ach.

Thallus a thick, cracked-areolate, grey-white to brown-grey crust, yellow with KOH and orange-red with sodium hypochlorite, soredia absent; apothecia clustered, constricted beneath and standing away from the thallus at maturity, discs yellow-brown but thickly grey-pruinose. Rare, on siliceous rock-faces in the Scottish Highlands.

Refs: Smith et al. (2009), 500; Purvis et al. (1992), 317; Wirth (1995), 1: 457, 487 (photo); Wirth, Hauck & Schulz (2013), 1: 560, 582, 602 (photo); Hansen & Andersen (1995), 97 (different subspecies? – as L. subradiosa).

Lecanora swartzii
Lecanora swartzii
Lecanora swartzii, enlarged
On an apparently iron-rich, montane rockface, Braemar, Aberdeenshire, March 2008

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© A.J. Silverside
Uploaded November 2008, last updated September 2013