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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.

 
Psilolechia lucida
On sheltered, siliceous rock, Mar Estate, Aberdeenshire, April 2008
 
Psilolechia lucida
Psilolechia lucida
In shaded crevice of drystone wall, Muirshiel, Renfrewshire, June 2008
 
Psilolechia lucida on gravestone
Psilolechia lucida on gravestone
Psilolechia lucida on gravestone
Psilolechia lucida on gravestone
On old gravestone (dates 1782, 1807), Littlebury, Essex, July 2009
 
Psilolechia lucida on gravestone
On back of old gravestone (dates 1865, 1871), Littlebury, Essex, July 2009


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Uploaded August 2009, last updated December 2013