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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.


Belonia nidarosiensis
On shaded limestone rockface, Braemar, Aberdeenshire, April 2002
Belonia nidarosiensis
Belonia nidarosiensis
On shaded limestone rockface, with Diploschistes gypsaceus, Braemar, Aberdeenshire, March 2008
Belonia nidarosiensis on gravestone
Belonia community (microscopically confirmed), with Caloplaca spp., Diploicia canescens, Physconia grisea, Haematomma ochroleucum var.
ochroleucum, Verrucaria muralis, Lecanora campestris s.l., on back of old (1830), limestone gravestone, Littlebury, Essex, July 2009

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© A.J. Silverside
Posted March 2008, last updated January 2016 (first posted at, January 2003)