Images of British Lichens
Fulgensia fulgens (Sw.) Elenkin
Thallus squamulose or forming a crust with lobed edges (placodioid), egg yellow, strongly pruinose, with surface at the centre forming flake-like shizidia that break away to expose the white medulla; apothecia orange, with narrow, thalline margins. A rare and declining species of calcareous soils, on dunes and where sand has blown over limestone, on coasts of south-west England and S. Wales; formerly on chalk at a few sites further east and in Breckland but apparently now extinct in these areas.
Refs: Smith et al. (2009), 406; Purvis et al. (1992), 251; Dobson (2005), 176 (photo); Dobson (2011), 182 (photo); Jahns (1983), 248-9 (photo); Wirth et al. (2004), 397 (photo); Wirth et al. (2004), 174 (photo); Wirth, Hauck & Schulz (2013), 1: 484 (photo), 485-6; Moberg & Holmåson (1984), 189 (photo); Thomson (1997), 229-30 (photo).
F. fulgens was part of a remarkable community of rare species that has largely vanished from the East Anglian Breckland, no doubt partly due to major habitat destruction of this unique area, but seemingly also as a result of atmospheric nitrate/ammonia deposition from traffic fumes and agricultural drift, with consequently enhanced competition from pleurocarpous mosses, grasses and other vegetation.
FGBI: http://fungi.myspecies.info/all-fungi/gyalolechia-fulgens (as Gyalolechia fulgens)
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Uploaded January 2012, last updated January 2016