Description: This tiny, epiphytic crustose lichen of large twigs and branches would most probably need to be collected for certain identification. Although fairly well distributed, the small branches of acid-barked trees such as oak would first need to be scanned with a hand lens looking carefully in the gaps between foliose lichens for signs of the dirty grey-green, granular thallus and minute, convex, shiny red-brown to brown-black discs (0.2-0.3mm diam.). Under the microscope a squash of the disc will show the spores to be spindly and mostly seven-septate.

Key Identification Features:

• Granular, green-black thallus (about 0.5-2.0cm in extent) scattered with neat, convex, shiny red-brown discs
• Spores straight, slightly curved or spindle-like, seven-septate.

Original text submitted by Vince J. Giavarini

Distribution Map from NBN: Scoliciosporum chlorococcum at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Scoliciosporum chlorococcum at iNaturalist World Species Observations database.