Description: Very like Micarea lignaria but with smaller, consistently three-septate spores and habitat of coastal rocks and scattered stones. It should be noted that this is an arctic species; its taxonomy is suspect; a revision of its 1 identity is overdue. In Ireland, the species is known from Connemara.

Key Identification Features:

• In appearance very similar to M. lignaria
• Spores no more than three-septate and smaller in length (<22µm) than in that species; coastal rocks.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Micarea ternaria at iNaturalist World Species Observations database.