Lichen with white fimbriate edge

Lichen with white fimbriate edge

Observation - Lichen with white fimbriate edge - UK and Ireland. Description: Grey-green, powdery, crustose lichen on siliceous sandstone gravestone. Thallus K+ yellow. Outer edge consists of a white fimbriate prothallus. Possibly Haematomma ochroleucum.

Grey-green, powdery, crustose lichen on siliceous sandstone gravestone. Thallus K+ yellow. Outer edge consists of a white fimbriate prothallus. Possibly Haematomma ochroleucum.