Description: This greenish-brown to black ‘jelly lichen’ is most frequently seen on damp, artificial calcareous substrates such as wall tops and mortar. When wet, it becomes swollen. The thallus is covered in rounded, overlapping lobes that are densely clustered. It is common in suitable localities throughout Ireland.

Key Identification Features:

• It has many overlapping lobes that are covered with more or less semicircular flattened lobes or isidia
• Discs are uncommon.

Original text submitted by Simon Davey

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

iNaturalist: Blennothallia crispa at iNaturalist World Species Observations database.