Description: Known from Counties Cork and Carlow this lichenicolous species has black, rounded, convex discs and should be searched for on the thallus of Diplotomma alboatrum. The one-septate spores range from colourless when young to brown and warted when fully developed.

Key Identification Features:

• Lichenicolous on the thallus of Diplotomma alboatrum
• Discs black, convex with spores brown and warted with age.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Arthonia punctella at iNaturalist World Species Observations database.