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Caloplaca aurantia (Pers.) Hellb.


Thallus egg yellow to orange, placodioid (i.e. a crust but lobulate at the margins), often (as in related species) with a whitish zone at the base of the lobules and with the interior of the thallus often yellow-brown, lobules markedly flattened as if ironed; apothecia deeper orange to orange-brown and crowded in the centre of the thallus. Generally on limestone rocks and stonework, predominantly in south-eastern England but extending west on sunny, limestone outcrops.

Refs: Gaya (2009), 108, 187 (photo); Smith et al. (2009), 255; Purvis et al. (1992), 146; Dobson (2005), 96 (photo); Dobson (2011), 105 (photo); Whelan (2011), 57 (photo); van Herk & Aptroot (2004, 2013), 88-9 (photo); Wirth (1995), 1: 216, 221 (photo); Wirth et al. (2004), 234 (photo); Wirth, Hauck & Schulz (2013), 1: 283, 284 (photo); Puntillo (1996), plate 8 (photo); Lichen Atlas of the British Isles 6: 239 (2001).

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

 
Caloplaca aurantia
Caloplaca aurantia
Caloplaca aurantia
On coastal limestone, Stackpole, Pembrokeshire, May 2009
 
Caloplaca aurantia
Caloplaca aurantia
On limestone block in church wall, Holme next the Sea, Norfolk, July 2009


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© A.J. Silverside
Uploaded July 2009, last updated January 2016