Lecanoraceae Myriolecis andrewii (Lecanora andrewii) Growth type crustose. BLS conservation evaluation: LC NS Disc and inner thalline margin K- or faint yellow, C+ orange-red, KC+ red, P+ orange-red, UV+ bright orange Rare on siliceous coastal rocks in the xeric-supralittoral zone. Thallus inconspicuous or sparse, of white coarse, rounded, scattered granules. Apothecia large, discs pale-brown to reddish-brown, sometimes white-pruinose with thick persistent, starkly white, uneven, crenullate or contorted margins. Spores 9-12(-13) x 5-6 µm, often guttulate. Similar: Lecanora fugiens, light yellowish to yellow-brown thallus, apothecia margins thinner and duller

Myriolecis andrewii (Lecanora andrewii)
On chert, Portland, Dorset. February 2016