Verrucaria obfuscans  

Thallus: superficial, greenish-brown to brown, composed of rounded algal units agglomerated into irregular areoles. A thin pseudocortex composed of small-celled paraplectenchyma is overlain by dead cells. The algal layer occupies much of the thickness of the thallus. The algal cells are up to 8-10 µm in diameter, arranged in weakly defined columns.

Teleomorph: Ascomata perithecioid. Perithecia forming projections 100-200 µm in diameter, mainly one quarter to half immersed, sometimes more deeply immersed. Usually one perithecium is present per algal unit, several such units agglomerated into each areole. Involucrellum absent. Exciple brown throughout in mature perithecia, globose, 180-250 µm. Periphysoids unbranched, 20-25 µm long. Ascospores colourless, simple or sometimes also two-celled, narrowly oblong-ellipsoid, 16-22 x 7-8 µm.

Anamorph: not known.