Caloplaca decipiens (images of British lichens)

Thallus yellow to dull orange, placodioid, variably white-pruinose, lobules convex, with lip-shaped to rounded soralia on lobule margins in the central area of the thallus; apothecia orange, rare. Locally common, more so in eastern Britain, on calcareous stonework, walls and cement, also on coastal rocks in the west, especially limestone, associated with bird perching.

Refs: Gaya (2009), 66, 181 (photo); Smith et al. (2009), 261; Purvis et al. (1992), 151; Dobson (2005), 101 (photo); Dobson (2011), 110 (photo); Whelan (2011), 59 (photo); Wirth (1995), 1: 216, 217 (photo); Wirth et al. (2004), 237 (photo); van Herk & Aptroot (2004), 94-95 (photo); Moberg & Holmåson (1984), 186 (photo); Lichen Atlas of the British Isles 6: 250 (2001).

lastdragon.org

Images of British Lichens