Description: A rarity in Ireland, this ‘pin-lichen’ has a scaly-granular, Pd- thallus, average-sized discs (1-1.9mm tall) and a icing of white pruina on the underside of the head that is sometimes absent. Only confused with C. xyloxena which has its thallus completely immersed and discs thickly whitened with pruina. The thallus of C. brunneola is consistently Pd+ yellow-red. It grows in the dry bark crevices of acid-barked trees. Northern Ireland, local in the south.

Key Identification Features:

• Thallus scaly to granular, Pd-
• White pruina faintly discernible on underside of head.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Chaenotheca trichialis at iNaturalist World Species Observations database.