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Images of British Lichens

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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© A.J. Silverside
Uploaded April 2014