Opegrapha gyrocarpa (images of British lichens)

Thallus generally rather thin, pale to dark orange-brown with a black marginal prothallus, usually speckled with orange-yellow soredia; apothecia black, lirellate, contorted, rare. Widespread and locally frequent, mainly in the north and west, forming mosaics on sheltered surfaces of base-poor rocks. Not unlike Belonia nidarosiensis when lacking apothecia but in less lime-rich situations.

Refs: Smith et al. (2009), 639; Purvis et al. (1992), 408; Dobson (2005), 294 (photo); Dobson (2011), 297 (photo); Whelan (2011), 119 (photo); van Herk & Aptroot (2004), 268-269 (photo); Wirth (1995), 2: 621 (photo); Thomson (1997), 437.

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Images of British Lichens