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Images of British Lichens

Lecanora orosthea (Ach.) Ach.

Thallus yellowish or yellow-green, a thin, often extensive, corticate, continuous crust bounded by a white prothallus, surface becoming cracked-areolate and with soredia forming initially on the areole margins, later covering much of the thallus surface; apothecia rare. Widespread on dry siliceous rocks and walls, often below overhangs.

Refs: Smith et al. (2009), 492; Purvis et al. (1992), 310; Dobson (2005), 226 (photo); Dobson (2011), 229-30 (photo); Wirth (1995), 1: 452-453; Wirth, Hauck & Schulz (2013), 1: 576, 577 (photo); van Herk & Aptroot (2004, 2013), 216-217 (photo).

Lepraria ecorticata is very similar, but the thallus lacks a cortex at any time.

Lecanora orosthea
Sheltered upland rocks, Braemar, Aberdeenshire, April 2002
Lecanora orosthea
Lecanora orosthea, close-up, showing white prothallus and soredia on areolar margins
On sheltered stone wall, Longniddry, East Lothian, May 2007

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© A.J. Silverside
Uploaded March 2008, last updated December 2013 (first hosted at, January 2003)