Protoparmelia nephaea (images of British lichens)

Thallus a chestnut brown, areolate crust, with a black prothallus that, when first establishing and at the margins, forms minute, radiating lobes; areoles occasionally with soralia, prothallus margins often sooty with conidia, apothecia rare. On rockfaces in the Scottish Highlands, rare.

Refs: Smith et al. (2009), 755; Purvis et al. (1992), 503; Wirth (1995), 1: 454 (in Lecanora key).

lastdragon.org

Images of British Lichens