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Images of British Lichens



Opegrapha gyrocarpa Flotow


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, ascospores 3-septate, (12-)17-25(-30) × (3-)4-6 µm (dimensions from Pentecost & James, in Smith et al., 2009). 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, 2013), 268-269 (photo); Wirth (1995), 2: 621 (photo); Wirth, Hauck & Schulz (2013), 2: 788, 792 (photo); Thomson (1997), 437.

 
Opegrapha gyrocarpa
On siliceous rockface, Kindrogan, Perthshire, March 2008


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uploaded February 2009, last updated February 2014