Description: Very like C. crenularia (described elsewhere) but is an epiphyte with a paler grey thallus and larger discs (to 2mm diam.) most frequent on hazel and in willow swamp. It may also be found on the main trunk of trees with a basic bark. It appears to have increased its range significantly in recent years.

Key Identification Features:

• The large, bright orange fruits on a thin, immersed and insignificant thallus on tree bark indicate this species
• It is one of only a very few members of the genus that in Ireland grow as epiphytes.

Original text submitted by Simon Davey

Distribution Map from NBN: Blastenia ferruginea s. lat. at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Blastenia ferruginea s. lat. at iNaturalist World Species Observations database.