Caloplaca microthallina possibly

Caloplaca microthallina possibly

Observation - Caloplaca microthallina possibly - UK and Ireland. Description: Growing on a rock regularly covered by the sea at high tide. It resembles a fine dusting of yellow powder on top of the black lichen (Hydropunctaraia/Verrucaria sp). I have not yet tested it with KOH but will on my next visit that way. It is present on se

Growing on a rock regularly covered by the sea at high tide. It resembles a fine dusting of yellow powder on top of the black lichen (Hydropunctaraia/Verrucaria sp). I have not yet tested it with KOH but will on my next visit that way. It is present on several of the rocks in this area, but always so difficult to show in a photo.