Irish lichens
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Order: Lecanorales
Family: Parmeliaceae
Species: Usnea cornuta s. lat Photos: On Birch trunk. Bantry, Cork, SW Ireland. Not blackened at base. Side branches markedly constricted where joining main stem, few pale annulations. Smooth cortex with small white dots developing isidia and granular soredia. Medulla lax. Widespread on +/- shaded tree trunks, also on rocks in woodland. Medulla K+ yellow turning red and Pd+ yellow turning orange/red. The Usnea cornuta s. lat aggregate comprises Usnea arianae, Usnea cornuta, Usnea subpectinata Sometimes host to Biatoropsis hafellneri |
Usnea cornuta