Species: Melanelixia subaurifera
Photos: On Sorbus and Oak. Co. Cork, SW Ireland.
Dull-green or brownish-green adpressed lobes. Under-surface is black with simple rhizines. Clumps of short, simple, globose isidia often disintegrating into soredia then eroding leaving pale marks. Apothecia are rare, margins becoming sorediate.
On well-lit smooth-barked trees, usually on twigs and branches.
Medulla: C+ red, UV-. Rubbing a finger over soralia or isidia shows pale yellow-white marks.
Similar: M. fuliginosa subsp. glabratula. Shiny greenish lobes.
Melanelixia subaurifera. February and August 2009