Description: This lichen of damp calcareous rock can usually be found by careful searching of habitats such as cliffs and screes. The dark brown spores are a useful microscopic character, but in the field, the best clue to its identification are the grey-brown, platy areoles which link together to form a lumpy collar (like papier mâché) around the base and middle of the discs (perithecia), sometimes almost strangling them. This species does not form pits. The spores, (50–70µm long), are on the large side. In Ireland, the species is very thinly scattered.

Key Identification Features:

• Thallus of convex areoles, grey-brown, forming a collar around the non-pit-forming perithecia
• Spores brown, large, muriform (like an Easter egg).

Original text submitted by Vince J. Giavarini

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

iNaturalist: Henrica theleodes at iNaturalist World Species Observations database.