Order: Lecanorales       Family: Parmeliaceae Species: Hypotrachyna britannica Growth type foliose. Identified by John Douglass Photos: On rocks. Ballingeary and Gougane Barra, Cork, SW Ireland Whitish-grey or pale bluish-grey lobes, +/- maculate, +/- indented. Lobe tips often brownish and +/- ascending. Under surfaces black with pale brown margins, tufted or simple rhizines, marginal cilia rare. Medulla white. Blue-black soredia develop from pustules on lobes but remain sub-marginal. Apothecia absent. Occurs on sheltered, well-lit siliceous rocks, often coastal. Cortex K+ yellow. Medulla K-, C+ red, KC+ red, P-, UV- Similar: Hypotrachyna afrorevoluta.

Hypotrachyna britannica. December 2008 and August 2009