Teloschistaceae Xanthocarpia ochracea (Caloplaca ochracea) Chemical results: K+ crimson Inland and coastal distribution on hard, natural limestone. Thin yellow-white or pale-yellow thallus, the dark orange-yellow apothecia concave or flat (never convex) with thick, slightly paler margins. Spores become 4-loculate when mature, 12-15 x 5-7 µm. Similar: Caloplaca dalmatica has a finely areolate thallus and spores that remain 2-celled

Xanthocarpia ochracea (Caloplaca ochracea)
On limestone, Portland, Dorset. February 2016