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Images of British Lichens



Tephromela atra (Huds.) Hafellner


Thallus crustose, pale grey, cracked-areolate and warted, looking much like fossilised porridge; apothecia conspicuous and usually abundant, discs black, rims grey-white and crenulate, hymenium with purplish colours in section. Throughout the country on hard, exposed rocks, often dominant on coastal rocks but also common inland.

Refs: Smith et al. (2009), 876; Purvis et al. (1992), 591; Dobson (2005), 422 (photo); Dobson (2011), 428 (photo); Jahns (1983), 206-7 (photo, as Lecanora atra); Allen (2007), 35 (photo); Whelan (2011), 145 (photo); van Herk & Aptroot (2004, 2013), 358-9 (photo); Valcárcel et al. (2003), 358-9 (photo); Wirth (1995), 2: 891, 893 (photo); Wirth et al. (2004), 208 (photo); Wirth, Hauck & Schulz (2013), 2: 1079 (photo); Moberg & Holmåson (1984), 112 (photo, as Lecanora atra); Stenroos et al. (2011), 449 (photo); Brodo et al. (2001), 676-7 (photo); Øvstedal & Lewis Smith (2001), 324, plates 82 & 83 (photos); Thomson (1997), 603.

Easily confused with Lecanora gangaleoides, with which it may grow, but L. gangaleoides typically has a slightly darker, sometimes greenish tinted thallus, orange colour in the lower medulla (pick away the surface) and it lacks the purple colours internally in the apothecia.

Tephromela atra
Tephromela atra
Coastal rocks, Turnberry, Ayrshire, June 2011
 
Tephromela atra
Coastal rocks, Arbroath, Angus, April 2002


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© A.J. Silverside
Uploaded August 2008, last updated December 2013 (first hosted at www-biol.paisley.ac.uk, January 2003)