Coenogoniaceae Coenogonium luteum (Dimerella lutea) Growth type crustose Chemical results negative Occurs over mosses on soil and bark and occasionally on rocks in shady, damp old woodland Thin light green-grey thallus, orange apothecia with paler margins, appearing +/- translucent in wet conditions. Pale yellow pycnidia are occasionally produced. Spores colourless, 1-septate. Apothecia possibly seasonal. Similar: Dimerella pineti. Caloplaca species are K+ red.

Dimerella lutea
On Oak. Holton Lee, Dorset. March 2013