Description: Rare on sallow in Killarney National Park, this species is often overlooked for Pertusaria pupillaris (Pd+ rust-red) or similar sorediate crusts. However, the soredia of this species are Pd+ pale yellow. The small discs, when present, are a beautiful scarlet red. When these are present, it is unmistakable.

Key Identification Features:

• Tiny, scarlet-red discs; soredia Pd+ pale yellow
• On sallow bark in moist woodlands.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Haematomma sorediatum at iNaturalist World Species Observations database.