Species: Melanohalea exasperata
Photos: On Salix twigs. Ballingeary area, Cork, SW Ireland.
Short olive-green, wrinkled and adpressed lobes with numerous warts with pale craters. Under-surface with rhizines. Usually fertile, red-brown apothecia with thick, warted margins. Papillae are flat-topped with pseudocyphellae at their tips. Isidia are absent.
The asci are 8-spored with simple spores, 9-12 x 5-6 Ám. Microscope photographs below.
On well-lit twigs and branches of acid-barked deciduous trees, rarely occurs on trunks. Chemical reactions negative.
Sometimes host to an undescribed species of Abrothallus