Description: This lichen grows exclusively on the thallus of Thelotrema petractoides in oceanic swamp woodlands. The minute discs grow to <0.3mm wide, have four-spored asci and three-septate spores that reach 15–18µm long.

Key Identification Features:

• Search for this on the thallus of Thelotrema petractoides, discs, slit-like
• Asci, four-spored, the spores three-septate.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Opegrapha brevis at iNaturalist World Species Observations database.