Green-yellow crustose lichen

Green-yellow crustose lichen

Observation - Green-yellow crustose lichen - UK and Ireland. Description: Areolate crustose thallus, covered in green-yellow granules, growing on brick wall buttress. Lecanorine apothecia with yellow-orange discs and granules around thalline margin. K+ crimson. Possibly Caloplaca citrina.

Areolate crustose thallus, covered in green-yellow granules, growing on brick wall buttress. Lecanorine apothecia with yellow-orange discs and granules around thalline margin. K+ crimson. Possibly Caloplaca citrina.