Images of British Lichens
Psilolechia lucida (Ach.) M.Choisy
Thallus a thin to granular, powdery, yellow-green to sulphur yellow crust, in places thicker and irregularly cracked; apothecia rare, very small, yellow-green to orange. Common throughout Britain, often in somewhat shaded situations, generally on base-poor rock, especially crevices in drystone walls, rarely on bark, also common but easily overlooked on urban brick and stonework.
Refs: Smith et al. (2009), 763; Purvis et al. (1992), 508; Dobson (2005), 371-2 (photo); Dobson (2011), 375 (photo); Wirth et al. (2004), 304 (photo); van Herk & Aptroot (2004, 2013), 324-5 (photo, atypical); Wirth (1995), 2: 784 (photos); Wirth, Hauck & Schulz (2013), 2: 945 (photo), 946; Moberg & Holmåson (1984), 124 (photo, as Lecidea lucida); Holien & Tønsberg (2008), 185 (photo); Stenroos et al. (2011), 385-6 (photos); Brodo et al. (2001), 596 (photo).
When on bark, very difficult to separate from Chrysothrix candelaris or barren Chaenotheca furfuracea, and could also be confused with Bacidia adastra; on rock could be confused with Lepraria ecorticata or perhaps with densely sorediate states of Lecanora orosthea.
|On sheltered, siliceous rock, Mar Estate, Aberdeenshire, April 2008|
|In shaded crevice of drystone wall, Muirshiel, Renfrewshire, June 2008|
|On old gravestone (dates 1782, 1807), Littlebury, Essex, July 2009|
|On back of old gravestone (dates 1865, 1871), Littlebury, Essex, July 2009|
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Uploaded August 2009, last updated December 2013