Acarospora fuscata Brown Cobblestone Lichen

This nitrophilic, crustose lichen has a characteristic brown-cracked appearance. It grows on siliceous rocks and is thought to be parasitic on other nitrophilic saxicolous lichens, at least during its early development. Most records within the recording area are on quartz-rich Upper Old Red Sandstone conglermerate outcrops and boulders found in west and central Gower, with occasional records in east. As with most lichens, more recording effort is required to better understand true patterns of distribution.  

Listed by Alan Orange in Flora of Glamorgan (Wade et al, 1994)