Images of British Lichens
Belonia nidarosiensis (Kindt) P.M.Jørg. & Vězda
Thallus a thin, orange to pinkish or red-brown, continuous to cracked-areolate, powdery-sorediate crust; apothecia rare, pink to red. Widespread on dry, vertical surfaces of calcareous rocks and walls. The photobiont is a Trentepohlia, most likely T. umbrina, and this alga can form free-living sheets of similar colour on walls and rocks – microscopic examination is sometimes advisable.
Refs: Smith et al. (2009), 212; Purvis et al. (1992), 118; Dobson (2005), 83 (photo); Dobson (2011), 90 (photo); Dalby & Dalby (2005), 29 (photo, with apothecia); Whelan (2011), 54 (photo).
Opegrapha gyrocarpa, when lacking apothecia, can look very similar, but it occurs in less calcareous situations.
|On shaded limestone rockface, Braemar, Aberdeenshire, April 2002|
|On shaded limestone rockface, with Diploschistes gypsaceus, Braemar, Aberdeenshire, March 2008|
|Belonia community (microscopically confirmed), with Caloplaca spp., Diploicia canescens, Physconia grisea, Haematomma ochroleucum var.|
ochroleucum, Verrucaria muralis, Lecanora campestris, on back of old (1830), limestone gravestone, Littlebury, Essex, July 2009
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© A.J. Silverside
Posted March 2008, last modified June 2012 (first posted at www-biol.paisley.ac.uk, January 2003)