Description: This eye-catching species forms blue-green patches on the squamules of Cladonia lichens, especially C. polydactyla in wooded rather than open situations. The presence of the species is noticeable, even though the host may be sterile (without discs). Discs uncommon, black; spores to 28-septate. In Ireland, records are scattered.

Key Identification Features:

• Parasitic on the squamules of Cladonia lichens
• Thallus bright blue-green hence the name: aeruginosa.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Arthrorhaphis aeruginosa at iNaturalist World Species Observations database.