Description: This Thelotrema resembles the much commoner T. lepidinum in general appearance, but has a grey-green (not creamy) thallus and discs with a narrower opening. The large-sized spores are grey-brown when mature, not colourless as in T. lepidinum. It grows in boggy, long-undisturbed oceanic woodlands, especially on twigs of hazel; also on ash. Western Ireland.

Key Identification Features:

• Grey-green thallus, usually on twigs rather than broad areas of exposed bark
• Spores large and dark-coloured, sometimes visible with a lens on the surface of the discs.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Thelotrema monosporum at iNaturalist World Species Observations database.