Teloschistaceae Gyalolechia flavovirescens (Caloplaca flavovirescens) Growth type crustose. Chemical results: K+ crimson Usually on calcareous rocks and man-made substrates, but also found on coastal and acidic rocks affected by more basic downwash. Rare on saltmarsh timbers. Sometimes parasitised by Verrucaria latericola Areolate greenish-yellow or orange thallus surrounded by pale prothallus. Abundant orange-brown apothecia with paler margins. Hymenium without oil droplets, spores 15-20 x 5-10 µm with a wide septum Similar: Caloplaca crenulatella is smaller, spores have narrow septum. Caloplaca flavorubescens. Hymenium with oil droplets. Rare, corticolous.

Caloplaca flavovirescens
Dorset. January 2013, February 2017. On wood, Studland Heath, June 2015