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Caloplaca teicholyta (Ach.) J.Steiner


Thallus white to whitish grey, corticate at least when young, forming irregular to rounded crusts, irregularly and sometimes rather obscurely lobed (placodioid) at the margins, surface scurfy, eroding towards the centre to become granular-sorediate (i.e. soralia not clearly delimited); apothecia uncommon, orange to red-brown, scattered and initially immersed in the thallus surface. Only the apothecia give the purple reaction with potassium hydroxide that generally characterises Caloplaca species. Locally common in the south and east, more restricted to the coast in the west, on calcareous rocks, walls and monuments; northern records are less certain due to past confusion with C. albolutescens.

Refs: Smith et al. (2009), 271; Wilk (2012), 10 & 25 (photos), 79-81; Purvis et al. (1992), 157; Dobson (2005), 107 (photo); Dobson (2011), 116 (photo); van Herk & Aptroot (2004, 2013), 106-107 (photo); Wirth (1995), 1: 214, 215 (photo); Wirth et al. (2004), 239 (photo); Wirth, Hauck & Schulz (2013), 1: 274, 279, 313 (photo); Puntillo (1996), plate 9 (photo); Lichen Atlas of the British Isles 6: 281 (2001).

When lacking apothecia, C. teicholyta can be confused with Diploicia canescens or Dirina massiliensis, with which it may grow.

Caloplaca teicholyta
On church wall, overgrowing C. aurantia, Holme next the Sea, Norfolk, July 2009
 
Caloplaca teicholyta
Caloplaca teicholyta
Caloplaca teicholyta, close view of margin
On limestone gravestone, Hatfield Broad Oak, Essex, May 2012


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Uploaded August 2009, last updated December 2013