Teloschistaceae Caloplaca microthallina Growth type crustose Chemical results: K+ crimson A maritime species often found parasitic on the thallus of Verrucaria maura or following cracks on acidic or calcareous coastal rocks Thallus of minute and often scattered orange-yellow lobes or squamules, prothallus absent. Conspicuous orange apothecia with crenulate margins. Soredia and isidia are absent.

Caloplaca microthallina
Kimmeridge Bay, Dorset. January 2013