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Images of British Lichens

Caloplaca ruderum (Malbr.) J.R.Laundon

Thallus thick, rather pale ochre-yellow, irregular and lumpy, with convex, pruinose areoles and lacking well-defined marginal lobules; apothecia urn-shaped when young, becoming flat or only slightly convex, discs brownish orange, thalline margins thick, pruinose. Generally on limestones and mortar, frequent only in south-east England and East Anglia, very local on base-rich and generally coastal rocks elsewhere.

Refs: Smith et al. (2009), 270; Purvis et al. (1992), 156; Dobson (2005), 106 (photo); Dobson (2011), 115 (photo); van Herk & Aptroot (2004, 2013), 104-105 (photo); Lichen Atlas of the British Isles 6: 275 (2001).

Caloplaca ruderum
Caloplaca ruderum
Caloplaca ruderum
Caloplaca ruderum
On limestone wall of church, Holme next the Sea, Norfolk, July 2009

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© A.J. Silverside
Uploaded August 2009, last updated December 2013