Melanohalea exasperata (De Not.) O. Blanco & al.
Melanelia exasperata (De Not.) Essl.
Thallus foliose, rosette-forming, 2-6 cm diam., lobes tightly appressed, apices rounded, flexible, upper surface with numerous papillae (small wart-like protuberances), tips plane to concave, minute volcano crater-like (pseudocyphella), bright green to dark green when moist, brown-greenish when dry, lower surface pale brown with simple rhizines, brown towards the center and cream towards the margin. Apothecia bowl-shaped, sessile, 2-6 mm diam., disc flat, green to brownish, exciple with numerous warts or papillae. Ascospores simple, ellipsoid, 9-12 x 5-6 µm. Photobiont: trebouxioid. Chemical spot tests negative. Rare, maritime trends, on branches and twigs of deciduous trees. In case of sterile specimen, see also Melanelixia subaurifera.*