Black-brown lichen on limestone

Black-brown lichen on limestone

Observation - Black-brown lichen on limestone . Description: Dark black-brown thallus growing on limestone gravestone. Thallus looks swollen and is covered with globular isidia and isidiate lecanorine apothecia. Possibly Collema auriforme.

Dark black-brown thallus growing on limestone gravestone. Thallus looks swollen and is covered with globular isidia and isidiate lecanorine apothecia. Possibly Collema auriforme.