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; van Herk & Aptroot
(2004), 216-217 (photo). Lepraria ecorticata is very similar,
but the thallus lacks a cortex at any time. |Sheltered upland
rocks, Braemar, Aberdeenshire, April 2002| |On sheltered stone
wall, Longniddry, East Lothian, May 2007| Lichens HOME PAGE |
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References | Site Home Page © A.J. Silverside Uploaded March
2008, last updated February 2013 (first hosted at www-
biol.paisley.ac.uk, January 2003)