Description: This extremely uncommon lichen of clay banks and soft cuttings has a green, filmy washed-out thallus and round spherical discs without a hardened layer (involucrellum) immersed within it. The simple colourless spores contain an abundance of oil bodies. In Ireland, the species is very rare.

Key Identification Features:

• Thallus a thin jelly-like film when wet; discs: immersed perithecia
• Spores simple, colourless with oil bodies; on clay cuttings by roadside ditches.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Thrombium epigaeum at iNaturalist World Species Observations database.