Description: As a rule, the ‘pin’ lichen Calicium species are relatively uncommon in Ireland. This is one of Ireland’s rarities, a minute species with yellow frosting (pruina) around the disc which is supported by a golf-tee-like stalk two-tenths of a millimetre tall. Its headquarters is Killarney where it grows on holly but there is also a second locality for it in County Fermanagh.

Key Identification Features:

• ‘Pin’ lichen with tiny stem and yellow pruina fringing the disc
• On holly in oceanic woodland.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Calicium diploellum at iNaturalist World Species Observations database.