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Trapelia coarctata (Turner ex Sm.) M.Choisy


Thallus white to pale or blueish or pinkish grey, thin to moderately thick, continuous or somewhat cracked, more rarely more dispersed-areolate, testing C+ red with bleach, lacking soredia or isidia; apothecia small but sometimes swollen when wet, red-brown, black when dry, forming within the thallus surface and initially looking more like immature perithecia or pushing up to form white spots, when mature with white, halo-like, often ragged, residual rims of thallus. Widespread and locally common on siliceous rocks, brick and stonework.

Refs: Smith et al. (2009), 907; Purvis et al. (1992), 611; Dobson (2005), 430 (photo); Dobson (2011), 437 (photo); van Herk & Aptroot (2004, 2013), 364-5 (photo); Valcárcel et al. (2003), 360-1 (photo); Puntillo (1996), plate 40 (photo); Wirth (1995), 2: 918, 919 (photo); Wirth et al. (2004), 207 (photo); Wirth, Hauck & Schulz (2013), 2: 1109 (photo), 1111; Holien & Tønsberg (2008), 190 (photo).

Trapelia coarctata
Wet material on stone wall, Balmaha, Stirlingshire, October 2008
 
Trapelia coarctata
Trapelia coarctata, closer view
On old brickwork, Paisley, Renfreshire, October 2009


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Uploaded April 2014