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Images of British Lichens



Caloplaca thallincola (Wedd.) Du Rietz


Thallus egg yellow (in shade) to bright yellow-orange and rather shiny, not pruinose, placodioid (i.e. a crust but lobulate at the margins) with marginal lobes usually long and finger-like, but lobing sometimes less evident on rough rock surfaces; apothecia with orange discs, rather scattered in the centre of the thallus. Generally common on hard, siliceous, coastal rocks in the north and west, frequently growing over the black crusts of Verrucaria maura. The closely similar C. flavescens can occur on moderately base-rich coastal rocks and requires careful distinction.

Refs: Gaya (2009), 110, 187 (photo); Smith et al. (2009), 272; Purvis et al. (1992), 158; Dobson (2005), 107-8 (photo); Dobson (2011), 116-7 (photo); Dalby & Dalby (2005), 23 (photo); Jahns (1983), 246-247 (photo); Whelan (2011), 63 (photo); van Herk & Aptroot (2004, 2013), 108-109 (photo); Wirth, Hauck & Schulz (2013), 1: 283, 315 (photo); Stenroos et al. (2011), 88-9 (photo); Lichen Atlas of the British Isles 6: 282 (2001).

FGBI: http://fungi.myspecies.info/all-fungi/caloplaca-thallincola

 
Caloplaca thallincola, growing over Verrucaria maura on coastal rocks
Caloplaca thallincola, apothecia
On coastal rocks, overgrowing Verrucaria maura, Millport, Great Cumbrae (Clyde Isles), April 2009
 
Caloplaca thallincola
Caloplaca thallincola
On coastal rockface, overgrowing Verrucaria maura, Kennedy's Pass, Ayrshire, May 2008,
thallus in upper photograph with film of mud from downwash
 
Caloplaca thallincola, growing over Verrucaria maura on coastal rocks
On coastal rockface, overgrowing Verrucaria maura, Arbroath, Angus, April 2002


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© A.J. Silverside
Uploaded March 2008, last updated January 2016 (first hosted at www-biol.paisley.ac.uk, January 2003)